This Keto Stuffed Pepper Casserole has all the comforting flavors of classic stuffed peppers in an easy, scoopable one-dish meal. Seasoned ground beef, tender bell peppers, tomatoes, cauliflower rice, and melted cheese come together for a hearty casserole that’s packed with savory flavor.
Instead of filling individual peppers, everything cooks together in one skillet before being finished with a generous layer of bubbly cheese. It’s an easy low-carb, high-protein dinner that works beautifully for busy weeknights and meal prep.
Can This Keto Stuffed Pepper Casserole Support Weight Loss Goals?
This casserole can fit into a weight-conscious eating pattern when portion sizes are matched to your overall calorie needs. Ground beef provides substantial protein, while vegetables and cauliflower rice add volume and fiber without relying on traditional rice.
Using lean ground beef and measuring the cheese and cooking oil can help keep the overall calories more moderate while preserving the casserole’s satisfying texture.
Does Keto Stuffed Pepper Casserole Fit a High-Protein Lifestyle?
Yes, this recipe is naturally protein-rich thanks to the ground beef and cheese, while cauliflower rice keeps the traditional rice component low in carbohydrates. Each serving provides approximately 31g of protein, making it a filling option for a high-protein meal plan. The vegetables contribute fiber and nutrients while keeping the net-carb count relatively modest.
Why This Recipe is Special
- Classic stuffed pepper flavor: All the familiar beef, pepper, tomato, and cheese flavors come together in one dish.
- Keto-friendly: Cauliflower rice replaces traditional white rice to significantly reduce carbohydrates.
- High in protein: Ground beef and cheese make the casserole hearty and satisfying.
- One-pan convenience: The filling is prepared mostly in one skillet before baking.
- Perfectly cheesy: A golden layer of melted cheese finishes the casserole beautifully.
My Personal Experience
- The beef and peppers work perfectly together:
Browning the beef first creates a rich savory base for the vegetables and seasonings.
The peppers soften just enough while still retaining a little texture. - Cauliflower rice blends right in:
It absorbs the tomato and beef flavors while giving the casserole the familiar texture of stuffed peppers.
Once covered with cheese, even picky cauliflower eaters may barely notice it. - The cheese topping makes it comfort food:
A bubbling layer of cheddar and mozzarella turns the whole casserole into something wonderfully rich.
Letting it brown slightly gives the top an irresistible golden finish.
Perfect For
- Keto and low-carb dinners
- High-protein meal plans
- Easy weeknight meals
- Family dinners
- Meal prep
- Freezer-friendly lunches
- Cozy comfort-food cravings
Why You’ll Love This Recipe
- All the stuffed-pepper flavor:
You get seasoned beef, sweet bell peppers, tomato, and cheese in every scoop.
There is no need to spend time stuffing individual peppers. - Low-carb comfort food:
Cauliflower rice provides the bulk and texture of rice without the same carbohydrate load.
It makes the casserole filling while keeping the recipe keto-friendly. - Easy cleanup:
Most of the preparation happens in one oven-safe skillet.
Fewer dishes make this a great choice for busy evenings. - Meal-prep friendly:
The casserole holds its texture well after refrigeration.
Individual portions can be reheated whenever you need a quick protein-rich meal.
Common Mistakes to Avoid
- Skipping the beef browning: Properly browned beef adds much more flavor than simply simmering it.
- Using watery cauliflower rice: Excess moisture can make the casserole soggy, so drain or squeeze thawed cauliflower rice well.
- Adding too much tomato sauce: Too much liquid can prevent the casserole from becoming thick and scoopable.
- Overcooking the peppers: Cook them until tender-crisp before baking so they don’t become mushy.
Required Equipment
- Large oven-safe skillet — Lets you cook and bake the casserole in the same dish.
- Wooden spoon — Makes breaking up and browning the ground beef easy.
- Chef’s knife — Quickly dices the peppers and onion evenly.
- Cheese grater — Freshly grated cheese melts smoothly over the casserole.
- Measuring cups and spoons — Keeps seasonings and portions consistent.
Storage Instructions
Let the casserole cool before transferring leftovers into airtight containers.
Refrigerate for up to 4 days.
For longer storage, portion the casserole into freezer-safe containers and freeze for up to 2 months. Thaw overnight in the refrigerator before reheating.
Reheat individual portions in the microwave or in a 350°F (175°C) oven until heated through. For a freshly melted cheese topping, place the portion under the broiler for 1–2 minutes.
Recipe Details
Preparation Time: 15 minutes
Cooking Time: 30 minutes
Total Time: 45 minutes
Servings: 6
Best Season: All-season
Total Calories: Approximately 425 calories per serving
Short Description
A hearty keto stuffed pepper casserole made with seasoned beef, colorful bell peppers, cauliflower rice, and tomatoes.
Everything is topped with melted cheddar and mozzarella for a bubbling, golden finish.
It’s an easy high-protein, low-carb comfort-food dinner that’s perfect for weeknights and meal prep.
📝 Ingredients
Beef & Vegetable Filling
- 1 lb (450 g) lean ground beef
- 2 medium bell peppers, diced
- 1 small yellow onion, diced
- 3 cloves garlic, minced
- 2 cups (200 g) cauliflower rice, fresh or frozen
- 1 cup (240 g) crushed tomatoes, no added sugar
- 2 tbsp tomato paste
- 1/2 cup (120 ml) beef broth
- 1 tsp smoked paprika
- 1 tsp Italian seasoning
- 1 tsp ground cumin
- 1/2 tsp salt
- 1/4 tsp black pepper
- 1/4 tsp red pepper flakes, optional
- 1 tbsp olive oil, if needed
Cheese Topping
- 1 cup (100 g) shredded cheddar cheese
- 1/2 cup (50 g) shredded mozzarella cheese
- 2 tbsp chopped fresh parsley or green onions, optional
Ingredient note: For the lowest carbohydrate count, choose plain crushed tomatoes and tomato paste with no added sugar and check the cauliflower rice label if using a packaged version.
Directions
- Preheat the oven:
Preheat your oven to 375°F (190°C). Use an oven-safe skillet if you want to bake the casserole in the same pan. - Brown the beef:
Heat the skillet over medium-high heat. Add the ground beef and cook for 6–8 minutes, breaking it apart as it browns.
Cook until no pink remains and some browned bits develop. - Cook the onion and peppers:
Add the diced onion and bell peppers. Reduce the heat to medium and cook for 4–5 minutes, stirring occasionally.
The vegetables should begin softening while still retaining some firmness. - Add the garlic:
Stir in the minced garlic and cook for 30–60 seconds, until fragrant. - Season the filling:
Add smoked paprika, Italian seasoning, cumin, salt, black pepper, and optional red pepper flakes. Stir well so the seasonings coat the beef and vegetables. - Add cauliflower rice:
Stir in the cauliflower rice and cook for 3–4 minutes.
If using frozen cauliflower rice, cook until the excess moisture has evaporated. - Add the tomato mixture:
Stir in crushed tomatoes, tomato paste, and beef broth. Reduce heat to medium-low and simmer for 7–10 minutes.
The mixture should be thick and cohesive rather than watery. - Add the cheese:
Turn off the heat and spread the beef mixture evenly in the skillet. Sprinkle cheddar and mozzarella over the top. - Bake:
Transfer the skillet to the oven and bake at 375°F (190°C) for 10–12 minutes, until the cheese is completely melted and bubbling. - Brown the topping:
Switch to broil/high heat for 1–2 minutes, watching closely.
Remove the casserole once the cheese develops golden-brown spots. - Rest and serve:
Let the casserole rest for 5 minutes before serving.
Garnish with fresh parsley or green onions for a fresh finish.
High-Protein Cooking Tip
For an even higher-protein casserole, use 90–95% lean ground beef and slightly increase the beef while keeping the cauliflower rice and vegetable portions generous. Freshly grated cheese also gives you a rich topping without needing an excessive amount.
Nutrition Facts
Per Serving — Approximate
- Calories: 425 kcal
- Fats: 27 g
- Cholesterol: 90 mg
- Sodium: 690 mg
- Potassium: 720 mg
- Total Carbohydrates: 14 g
- Fiber: 5 g
- Net Carbs: 9 g
- Sugars: 7 g
- Protein: 31 g
- Calcium: 265 mg
Nutrition values are approximate and vary depending on the beef, cheese, vegetables, tomatoes, and other brands used.
Notes
- If using frozen cauliflower rice, cook off as much moisture as possible before adding the tomatoes.
- Freshly grated cheese usually melts more smoothly than pre-shredded cheese.
- Green, red, yellow, or orange bell peppers can be used.
- Add diced jalapeños for extra heat.
- For a smoky flavor, increase the smoked paprika slightly.
- Letting the casserole rest before serving helps it set and makes it easier to portion.
- Store leftovers promptly in airtight containers.
- Reheat gently to prevent the beef from becoming dry.
- Check packaged ingredients for added sugar if following a strict keto plan.
Frequently Asked Questions
Can I use ground turkey instead of beef?
Yes, lean ground turkey works well and creates a lighter version while keeping the recipe protein-rich.
Can I use regular rice?
Yes, but regular rice will substantially increase the carbohydrate content and make the casserole unsuitable for a strict keto approach.
Can I make this casserole ahead of time?
Yes, prepare the filling up to one day ahead, refrigerate it covered, then add the cheese and bake when ready.
Can I freeze stuffed pepper casserole?
Yes, cool it completely, portion it into freezer-safe containers, and freeze for up to two months.
How do I keep the casserole from becoming watery?
Cook the cauliflower rice thoroughly and simmer the tomato mixture until most excess liquid has evaporated.
What cheese works best for the topping?
Cheddar provides a bold flavor while mozzarella adds excellent melt and stretch, making the combination ideal for this casserole.
