Keto Breakfast Casserole with Ground Turkey and Cheese

Name: Keto Breakfast Casserole with Ground Turkey and Cheese
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Yield: 6 servings
Cuisine: American
Ingredients: 1 lb lean ground turkey (93% lean works best); 10 large eggs; 1.5 cups sharp cheddar cheese (freshly grated, divided); 3 cups fresh baby spinach (roughly chopped); 1 cup roasted red peppers (jarred in water, drained and sliced); 1 medium yellow onion (finely diced); 3 cloves garlic (minced); 1 tbsp olive oil; 1 tsp smoked paprika; 1 tsp dried oregano; 0.5 tsp garlic powder; 0.5 tsp onion powder; 0.5 tsp fine sea salt (plus more to taste); 0.25 tsp black pepper (freshly ground); 0.25 cup unsweetened almond milk (or whole milk if not dairy free); 1 tsp hot sauce (optional, for a gentle kick)

High ProteinKetoGluten-FreeMeal PrepNut-Free

Prep Time15 min

Cook Time40 min

Servings6

Calories318 kcal

Health Score6/10

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Some mornings call for something seriously satisfying, and this keto breakfast casserole with ground turkey and cheese delivers exactly that. It is hearty without being heavy, packed with clean protein, and comes together with simple ingredients you likely already have in your fridge. Think seasoned ground turkey, fluffy baked eggs, vibrant spinach, roasted red peppers, and a generous blanket of sharp cheddar all baked into one golden, bubbly casserole. No breadcrumbs, no starchy fillers, no blood sugar spikes. Just real food that keeps you full and focused through the morning.

What makes this casserole genuinely healthier than the traditional kind is the protein-to-calorie ratio. Ground turkey is a brilliant base because it is lean, flavourful when seasoned well, and far lower in saturated fat than beef or pork alternatives. Paired with ten whole eggs, each serving hits around 32 grams of protein, which is exceptional for a breakfast dish. The spinach adds iron and folate, the red peppers bring vitamin C and a subtle sweetness, and the olive oil keeps everything moist without loading on unnecessary calories. Every ingredient is pulling its weight nutritionally.

The method here is straightforward and forgiving, which makes it a great recipe for Sunday batch cooking. You brown the turkey first with garlic, onion, smoked paprika, and dried oregano, building a deep savoury base. That turkey mixture gets layered into a baking dish with the wilted spinach and peppers, then a seasoned egg and cheese mixture is poured over the top before the whole thing goes into the oven. The result is a set, sliceable casserole with crispy golden edges, melty pockets of cheddar, and that satisfying egg-baked texture throughout. It slices cleanly once cooled slightly, making portioning for the week genuinely easy.

This recipe fits comfortably within a ketogenic eating plan, clocking in at under 4 grams of net carbs per serving. It is also naturally gluten free, which makes it a solid option if you are cooking for a mixed group. You can swap the cheddar for gruyere or pepper jack if you want a different flavour profile, or add sliced mushrooms and courgette to bulk it up further with extra fibre. Make it once and you have a grab-and-reheat breakfast sorted for five days straight. That kind of practical, nourishing cooking is exactly what busy mornings need.

Ingredients

Serves:6

1 lb lean ground turkey (93% lean works best)
10 large eggs
1.5 cups sharp cheddar cheese (freshly grated, divided)
3 cups fresh baby spinach (roughly chopped)
1 cup roasted red peppers (jarred in water, drained and sliced)
1 medium yellow onion (finely diced)
3 cloves garlic (minced)
1 tbsp olive oil
1 tsp smoked paprika
1 tsp dried oregano
0.5 tsp garlic powder
0.5 tsp onion powder
0.5 tsp fine sea salt (plus more to taste)
0.3 tsp black pepper (freshly ground)
0.3 cup unsweetened almond milk (or whole milk if not dairy free)
1 tsp hot sauce (optional, for a gentle kick)

Instructions

1
Preheat your oven to 375 degrees Fahrenheit (190 degrees Celsius). Lightly grease a 9x13 inch baking dish with olive oil or cooking spray and set aside.
A glass or ceramic baking dish works well here as it distributes heat evenly and prevents overbrowning on the bottom.
2
Heat the olive oil in a large skillet over medium heat. Add the diced onion and cook for 3 to 4 minutes until softened and translucent. Add the minced garlic and cook for another 30 seconds until fragrant.
3
Add the ground turkey to the skillet, breaking it apart with a wooden spoon. Season with smoked paprika, dried oregano, garlic powder, onion powder, salt, and black pepper. Cook for 6 to 8 minutes, stirring occasionally, until the turkey is fully cooked through with no pink remaining.
Do not crowd the pan. Let the turkey sit undisturbed for a minute or two at a time to develop some light browning, which adds flavour.
4
Add the chopped spinach to the skillet and stir it through the turkey mixture. Cook for 1 to 2 minutes until just wilted. Remove from heat and stir in the sliced roasted red peppers.
5
Transfer the turkey and vegetable mixture evenly into the prepared baking dish. Spread it out into a flat, even layer and scatter 1 cup of the grated cheddar cheese over the top.
6
In a large mixing bowl, whisk together the eggs, almond milk, the remaining 0.5 teaspoon of salt, a pinch of black pepper, and the hot sauce if using. Whisk until the mixture is smooth and uniform.
Whisking the eggs thoroughly gives you a lighter, fluffier set texture in the finished casserole.
7
Pour the egg mixture evenly over the turkey and cheese layer in the baking dish. Use a fork to gently press down any exposed turkey or vegetables so most of it is submerged in the egg mixture.
8
Scatter the remaining 0.5 cup of cheddar cheese evenly over the top of the casserole.
9
Bake uncovered in the preheated oven for 35 to 40 minutes, until the eggs are fully set in the centre and the top is golden and bubbly. A knife inserted into the middle should come out clean.
If the top is browning too quickly before the centre sets, loosely tent the dish with aluminium foil for the last 10 minutes.
10
Remove from the oven and allow the casserole to rest for 5 minutes before slicing. This helps it hold together cleanly when cut. Slice into 6 portions and serve warm.
Top with a dollop of full-fat Greek yogurt or a sprinkle of fresh chives for an optional finishing touch.

Nutrition per serving

318kcal

Calories

32g

Protein

Carbs

19g

Fat

1.2g

Fibre

2.5g

Sugar

480mg

Sodium

Pro Tips

✓
Grate your own cheddar rather than using pre-shredded. Bagged shredded cheese contains anti-caking agents that can make the topping less melty.
✓
Let the casserole cool for at least 5 minutes before cutting. This makes slicing much cleaner and helps each portion hold its shape.
✓
Browning the turkey well before baking is the single biggest flavour upgrade you can make. Do not rush this step.
✓
If you are prepping this the night before, store the cooked turkey mixture and the whisked egg mixture separately in the fridge. Combine and bake fresh in the morning for the best texture.
✓
To boost fibre further, stir a handful of finely chopped courgette or mushrooms into the turkey mixture before baking.

Frequently Asked Questions

Is this keto breakfast casserole with ground turkey and cheese truly low carb?↓

Yes. Each serving contains around 3.8 grams of net carbs, making it very suitable for a ketogenic diet. The carbs come primarily from the spinach, onion, and roasted peppers, all of which are low-glycaemic vegetables.

Can I make this casserole ahead of time?↓

Absolutely. You can bake it fully and refrigerate for up to 5 days, reheating individual slices as needed. Alternatively, assemble it the night before without baking and refrigerate, then bake fresh in the morning.

What can I use instead of almond milk?↓

Whole dairy milk, oat milk, or unsweetened coconut milk all work well here. For strict keto, stick with almond milk or a small amount of heavy cream thinned with water.

Can I freeze this casserole?↓

Yes. Slice it into individual portions, wrap each one tightly in cling film, and freeze for up to 2 months. Thaw overnight in the fridge and reheat in the microwave or oven.

How much protein does each serving contain?↓

Each slice provides approximately 32 grams of protein, coming from the combination of ground turkey and eggs. This makes it a genuinely high-protein breakfast option that supports muscle maintenance and satiety.

Can I use a different cheese?↓

Definitely. Gruyere, pepper jack, mozzarella, and smoked gouda all work beautifully in this recipe. Just stick to a full-fat cheese for the best melt and flavour.

Variations

•
Spicy Tex-Mex Version
Add 1 teaspoon of cumin and 0.5 teaspoon of chilli flakes to the turkey seasoning. Swap the roasted red peppers for diced green chillies and use pepper jack cheese in place of cheddar. Top with sliced avocado and a squeeze of lime to serve.
•
Mediterranean Style
Replace the cheddar with crumbled feta cheese. Add a handful of sliced kalamata olives and sun-dried tomatoes to the turkey layer. Season the turkey with dried basil and a pinch of cinnamon for a warm, Mediterranean flavour profile.
•
Extra Veggie Version
Add 1 cup of finely diced courgette and 1 cup of sliced mushrooms to the skillet when cooking the turkey. This increases the fibre content significantly and makes the casserole go further with fewer calories per serving.
•
Dairy-Free Version
Use a plant-based cheddar style shred in place of regular cheddar, and replace the almond milk with full-fat canned coconut milk. All other ingredients remain the same.

Substitutions

•
Ground turkey → Ground chicken (Ground chicken behaves almost identically to ground turkey here. Use 93% lean for a comparable fat and calorie count.)
•
Sharp cheddar cheese → Gruyere or pepper jack (Both melt well and add great flavour. Pepper jack adds a gentle heat, while gruyere brings a nuttier, more complex taste.)
•
Baby spinach → Kale or Swiss chard (Remove the tough stems and chop finely. Kale holds its texture slightly better during baking and adds extra fibre and iron.)
•
Roasted red peppers → Fresh diced bell peppers (If using fresh peppers, add them to the skillet with the onion and cook for 4 to 5 minutes until softened before adding the turkey.)
•
Unsweetened almond milk → Heavy cream diluted with water (Use 2 tablespoons of heavy cream mixed with 2 tablespoons of water for a richer, keto-friendly egg mixture.)

🧊 Storage

Allow the casserole to cool completely before covering. Store in an airtight container or cover the baking dish tightly with cling film or foil. Refrigerate for up to 5 days. Reheat individual slices in the microwave for 90 seconds on medium power, or in a 350F oven for 10 to 12 minutes until warmed through. Freeze individual slices wrapped tightly for up to 2 months.

📅 Make Ahead

You can fully cook and refrigerate this casserole up to 2 days in advance and simply reheat when ready to serve. For the freshest texture, assemble the unbaked casserole the night before, cover tightly, and refrigerate. Remove from the fridge 20 minutes before baking to take the chill off, then bake as directed, adding 5 extra minutes to the cook time.