This low carb turkey cheeseburger casserole is packed with lean ground turkey, cheddar cheese, and savory seasonings for a high-protein dinner. Ready in 30 minutes, it's a quick and easy…

Ingredients

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Instructions

Step 1

Preheat your oven to 375°F (190°C). While the oven is heating, gather all your ingredients and equipment: a large oven-safe skillet (preferably 12-inch cast iron or stainless steel) or a separate baking dish (9×13-inch). If using a baking dish, you’ll need a large skillet for stovetop cooking. Having everything prepped and measured (mise en place) ensures a smooth cooking process and prevents burning or overcooking. Dice the onion and mince the garlic; set aside. Shred the cheeses if not pre-shredded—pre-shredded cheese often contains anti-caking agents that can affect meltability, so for the best gooey texture, shred from a block.

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Step 2

Heat 1 tablespoon of olive oil in the large oven-safe skillet (or a regular skillet if transferring) over medium-high heat. Once the oil shimmers (about 30 seconds), add the diced onion. Sauté for 3-4 minutes, stirring occasionally, until the onion becomes translucent and starts to brown slightly at the edges. The browning, known as caramelization, develops natural sugars and adds depth of flavor. Add the minced garlic and cook for another 30 seconds until fragrant—be careful not to burn the garlic, as it turns bitter. This aromatic base is the foundation of the casserole’s savory profile.

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Step 3

Add the ground turkey to the skillet. Break it apart with a wooden spoon or spatula into small crumbles. Cook for 5-7 minutes, stirring occasionally, until the turkey is no longer pink and has reached an internal temperature of 165°F (74°C). As the turkey cooks, you’ll notice it releases moisture; continue cooking until most of the liquid evaporates and the meat begins to brown. This browning (Maillard reaction) is crucial for a rich, meaty flavor. Do not rush this step—proper browning can take up to 10 minutes. If the pan seems dry, you can add a splash of water or broth to deglaze any browned bits from the bottom, which are packed with flavor.

Step 4

Reduce the heat to medium-low. Add the salt, black pepper, paprika, garlic powder, onion powder, and mustard powder to the turkey mixture. Stir well to evenly coat the meat with the spices. Cook for 1 minute, allowing the spices to toast and bloom, which intensifies their aroma and flavor. Then, add the sugar-free ketchup, yellow mustard, Worcestershire sauce, and dill pickle relish. Stir until everything is thoroughly combined and the sauce coats the meat. The mixture should look glossy and smell like a classic cheeseburger. Taste and adjust seasoning if needed—you can add more salt, pepper, or a dash of hot sauce for heat.

Step 5

If using an oven-safe skillet, smooth the turkey mixture into an even layer. If using a separate baking dish, transfer the mixture to a lightly greased 9×13-inch baking dish and spread evenly. Sprinkle the shredded cheddar and mozzarella cheeses evenly over the top. For a more indulgent texture, you can also mix some cheese into the meat mixture before topping. The cheese will melt and form a golden, bubbly crust. Place the skillet or dish in the preheated oven and bake for 10-12 minutes, until the cheese is fully melted and lightly browned on the edges. If you prefer a deeper golden crust, you can switch to broil for the last 1-2 minutes, but watch closely to prevent burning.

Step 6

Remove from the oven and let the casserole rest for 2-3 minutes. This resting time allows the casserole to set slightly for cleaner slices. Garnish with chopped fresh parsley and optional chopped dill pickles for a fresh, tangy contrast. Serve hot, directly from the skillet or dish. This casserole pairs wonderfully with a side salad, steamed green beans, or cauliflower rice to keep the meal low carb. Leftovers can be stored in an airtight container in the refrigerator for up to 4 days. Reheat individual portions in the microwave or oven until warmed through.

For best results

  • For the best texture and flavor, use lean ground turkey with a fat content of 93/7 or 85/15. Higher fat content (like 80/20) can make the casserole greasy, while extra lean (99/1) may result in a dry, crumbly texture. If you only have extra lean turkey, consider adding a tablespoon of olive oil or a splash of chicken broth during cooking to maintain moisture. The Maillard browning is essential for depth, so don't skip the step of cooking until the meat is well-browned; this develops savory notes that mimic a classic burger patty.
  • Shred your own cheese from a block for superior melting. Pre-shredded cheeses are coated with cellulose or starch to prevent clumping, which can inhibit melting and create a grainy texture. A block of sharp cheddar and low-moisture mozzarella will melt into a smooth, creamy layer. For a stronger cheese flavor, try using extra-sharp cheddar or adding a sprinkle of smoked gouda. If you're dairy-sensitive, you can use dairy-free shredded cheese alternatives, but note that melting properties may vary—look for brands that specifically state they melt well.
  • Sugar-free ketchup is key to keeping this dish low carb. Many store-bought ketchups contain high-fructose corn syrup or added sugars, which can add up to 5-10 grams of carbs per tablespoon. Look for brands sweetened with stevia, erythritol, or monk fruit. If you don't have sugar-free ketchup, you can make your own by mixing tomato paste with a little water, vinegar, and a zero-calorie sweetener to taste. Alternatively, you can substitute with no-sugar-added tomato sauce or even salsa for a different flavor profile.
  • To make this casserole even quicker, you can cook the turkey and onion mixture ahead of time. Simply cook and season the meat, let it cool, and store it in the refrigerator for up to 3 days. When ready to bake, just transfer to a baking dish, top with cheese, and bake. This is a great meal prep strategy for busy weeknights. You can also freeze the unbaked casserole (without cheese) for up to 3 months. Thaw overnight in the fridge, then add cheese and bake as directed, adding 5-10 minutes to the baking time since it starts cold.
  • If you prefer a crispy top, after baking, switch the oven to broil for 1-2 minutes. Watch closely as broiling can quickly burn the cheese. For an extra crunch, you can also sprinkle crushed pork rinds or a low-carb breadcrumb alternative (like crushed almonds mixed with parmesan) over the cheese before baking. This adds a texture reminiscent of a breaded casserole without the carbs.
  • The dill pickle relish is a secret ingredient that adds tanginess and moisture, mimicking the pickle on a cheeseburger. If you don't have relish, you can finely chop dill pickles and add a teaspoon of pickle juice. The acidity cuts through the richness of the cheese and meat, balancing the flavors. For a sweeter note, you could use bread and butter pickle relish, but that will add a few carbs, so adjust your macros accordingly.

Variations

  • For a beef version, substitute ground turkey with lean ground beef (90/10). The beef will have a richer, more traditional cheeseburger flavor. You may want to reduce the salt slightly as beef can be saltier. Alternatively, use ground chicken or pork for different flavor profiles. Ground chicken is milder and pairs well with white cheddar, while ground pork adds a hint of sweetness that complements the mustard and pickles.
  • To make this dairy-free, use dairy-free shredded cheese alternatives (such as those made from coconut oil or cashews) and ensure your Worcestershire sauce is vegan (some contain anchovies). The texture may be slightly less gooey, but the flavor will still be delicious. You can also add a tablespoon of nutritional yeast to the meat mixture for a cheesy flavor without dairy.
  • For a spicy kick, add 1-2 teaspoons of hot sauce (like sriracha or Frank's RedHot) to the meat mixture along with the ketchup and mustard. You can also mix in diced jalapeños or a pinch of cayenne pepper. Top the casserole with sliced pickled jalapeños before baking for a Tex-Mex twist. Serve with a side of sour cream or Greek yogurt to cool the heat.
  • Turn this into a stuffed pepper casserole by adding 1-2 cups of diced bell peppers (any color) along with the onion. Sauté the peppers until slightly softened before adding the turkey. The peppers add sweetness, color, and extra nutrients. You can also mix in 1 cup of cauliflower rice (raw or pre-cooked) to bulk up the casserole with more vegetables and fiber while keeping it low carb.
  • For a Mexican-inspired version, replace the ketchup and mustard with 1/2 cup of salsa and 1 teaspoon of cumin. Use a Mexican cheese blend (cheddar, Monterey Jack, and queso quesadilla) and top with fresh cilantro and avocado slices. Serve with a side of low-carb tortilla chips or lettuce wraps for a taco bowl experience.

Nutrition

  • Calories320 kcal
  • Total Fat18g
  • Saturated Fat8g
  • Cholesterol95mg
  • Sodium780mg
  • Total Carbohydrates9g
  • Dietary Fiber1g
  • Sugars4g
  • Protein32g

Common Questions

Can I make this casserole ahead of time?
Yes, absolutely. You can prepare the entire casserole (without baking) up to 2 days in advance. Assemble the meat mixture in the baking dish, top with cheese, cover tightly with foil or plastic wrap, and refrigerate. When ready to bake, remove from the fridge 20 minutes before baking to take the chill off, then bake as directed, adding 5-10 minutes to the baking time since it starts cold. You can also freeze the unbaked casserole (without cheese) for up to 3 months; thaw overnight in the fridge, add cheese, and bake.
Is this casserole keto-friendly?
Yes, this turkey cheeseburger casserole is keto-friendly as long as you use sugar-free ketchup and watch your portion sizes. Each serving contains approximately 6-8 grams of net carbs (total carbs minus fiber), depending on the specific brands used. The main carb sources come from the onion, ketchup, and pickle relish, but these are minimal. For a stricter keto version, you can reduce the onion to half and use a relish with no added sugar. This casserole is also gluten-free, making it suitable for those with celiac disease or gluten sensitivity.
Can I use ground beef instead of turkey?
Absolutely. Substitute an equal amount of lean ground beef (90/10 or 85/15) for the turkey. The cooking time and instructions remain the same. Beef will have a richer flavor and slightly higher fat content, which can make the casserole more moist. If using higher fat beef (like 80/20), you may want to drain off excess fat after browning to prevent the casserole from being greasy. Ground chicken or pork also work well as substitutes.
How should I store leftovers and how long do they last?
Store leftovers in an airtight container in the refrigerator for up to 4 days. The casserole can also be frozen for up to 3 months. To reheat, microwave individual portions for 1-2 minutes or reheat in a 350°F oven for 10-15 minutes until warmed through. If frozen, thaw overnight in the fridge before reheating. The texture may be slightly softer upon reheating, but the flavor will remain delicious.
Can I add vegetables to this casserole?
Yes, this casserole is very versatile. You can add diced bell peppers, mushrooms, zucchini, or spinach. For bell peppers and mushrooms, sauté them with the onion until softened. For spinach, stir in a few handfuls of fresh spinach after cooking the turkey and let it wilt before adding the sauce. Adding vegetables will increase the volume and nutrient density, but may slightly increase the carb count. Keep the total vegetable additions to about 1-2 cups to maintain the casserole’s structure.
What can I use instead of Worcestershire sauce?
Worcestershire sauce adds a savory umami depth. If you don’t have it, you can substitute with 1 tablespoon of soy sauce (or tamari for gluten-free) plus a dash of vinegar (apple cider or red wine). Alternatively, use 1 tablespoon of fish sauce for a more intense flavor, or simply omit it and add a little extra salt and a pinch of sugar substitute. The casserole will still taste great, though slightly less complex.
Is this recipe suitable for meal prep?
Yes, this casserole is excellent for meal prep. Cook the entire casserole, let it cool, then portion it into individual containers. Store in the fridge for up to 4 days. You can reheat portions for quick lunches or dinners throughout the week. The flavors often meld and improve after a day in the fridge. To reheat, microwave for 1-2 minutes or reheat in a toaster oven at 350°F for 10 minutes. For best texture, avoid overcooking when reheating.
Can I make this casserole without an oven?
Yes, you can make a stovetop version. After cooking the turkey mixture and stirring in the cheese, cover the skillet and cook on low heat for 5-7 minutes until the cheese is melted. Alternatively, you can transfer the mixture to a microwave-safe dish, top with cheese, and microwave on high for 2-3 minutes until the cheese is bubbly. The stovetop or microwave method won’t produce the same browned top, but it’s still delicious and quick.