Low Carb Stuffed Pepper Casserole
If you love the cozy flavor of classic stuffed peppers but don’t want all the carbs from rice, this Low Carb Stuffed Pepper Casserole is exactly the kind of dinner to keep in your back pocket.
It has everything that makes stuffed peppers so comforting—savory ground beef, colorful bell peppers, onions, garlic, rich tomato sauce, Italian seasoning, and plenty of melted cheese—but skips the traditional rice.
Instead, the vegetables and beef simmer together in a rich, saucy mixture before getting covered with a blanket of gooey cheese.
This is one of those meals that makes the kitchen smell amazing while it cooks. It’s hearty enough to satisfy the whole family, simple enough for a weeknight, and comforting enough for a chilly evening when you want something warm and homemade.
And the best part?
Nobody misses the rice.
❤️ Why You’ll Love This Low Carb Casserole
Low carb and satisfying
No rice required
One-pan filling with easy cleanup
Packed with colorful bell peppers
High in protein
Cheesy and comforting
Great for weeknight dinners
Easy to meal prep
Freezer-friendly
Simple everyday ingredients
Naturally gluten-free
📋 Recipe Information
Prep Time: 15 minutes
Cook Time: 30–35 minutes
Total Time: About 50 minutes
Servings: 6
Course: Dinner, Main Dish
Cuisine: American, Low Carb
🛒 Ingredients
For the Casserole
1½ pounds 93% lean ground beef
3 large bell peppers, diced
1 medium onion, diced
3 cloves garlic, minced
1 can (14.5 ounces) diced tomatoes, preferably no-sugar-added
1 cup low-carb marinara or tomato sauce
1 teaspoon Italian seasoning
1 teaspoon paprika
½ teaspoon garlic powder
½ teaspoon onion powder
½ teaspoon salt, or to taste
¼ teaspoon black pepper
1½ cups shredded mozzarella cheese
½ cup shredded cheddar cheese
Cooking spray or 1 teaspoon olive oil
Optional Additions
½ teaspoon crushed red pepper flakes
Fresh parsley
Fresh basil
Grated Parmesan
Sliced jalapeños
Mushrooms
Zucchini
🍳 Equipment Needed
Large skillet
9×13-inch baking dish
Wooden spoon
Knife
Cutting board
Measuring cups and spoons
Aluminum foil
👩🍳 How to Make Low Carb Stuffed Pepper Casserole
Step 1: Preheat the Oven
Preheat your oven to 375°F (190°C).
Lightly grease a 9×13-inch baking dish and set it aside.
Step 2: Brown the Ground Beef
Heat a large skillet over medium-high heat.
Add the ground beef and cook for 6–8 minutes, breaking it apart with a wooden spoon as it browns.
Cook until no longer pink.
Drain excess grease if necessary.
Step 3: Add the Vegetables
Add the diced bell peppers and onion to the skillet.
Cook for 5–6 minutes, stirring occasionally, until the vegetables begin to soften.
Add the minced garlic and cook for another 30 seconds.
The combination of beef, onions, and garlic already gives the filling that wonderful homemade stuffed-pepper aroma.
Step 4: Add the Tomato Sauce
Stir in the diced tomatoes and low-carb marinara or tomato sauce.
Add:
Italian seasoning
Paprika
Garlic powder
Onion powder
Salt
Black pepper
If you like a little heat, add the crushed red pepper flakes too.
Stir well.
Step 5: Simmer
Reduce the heat to medium-low and let the mixture simmer for 8–10 minutes.
This step is important because it allows some of the excess moisture to cook away and gives the sauce time to thicken.
Taste and adjust the seasonings if needed.
Step 6: Assemble the Casserole
Transfer the beef and pepper mixture to your prepared baking dish.
Spread it evenly.
Sprinkle the mozzarella and cheddar cheese over the entire surface.
Don’t be shy with the cheese—the golden, bubbly topping is one of the best parts.
Step 7: Bake
Cover the casserole loosely with aluminum foil.
Bake for 15 minutes.
Remove the foil and continue baking for another 8–10 minutes, until the cheese is completely melted and bubbling.
For a more golden top, broil for 1–2 minutes, watching closely.
Step 8: Rest and Serve
Remove the casserole from the oven and let it rest for 5 minutes before serving.
This gives the sauce a chance to settle and makes it easier to scoop.
Garnish with fresh parsley or basil if desired.
💡 Tips for the Best Stuffed Pepper Casserole
Choose Colorful Peppers
Red, yellow, orange, and green peppers all work. A combination gives the casserole a beautiful color and slightly different flavors.
Cook Off Extra Liquid
Bell peppers and tomatoes release moisture as they cook. Simmering the filling before baking helps prevent a watery casserole.
Check Your Tomato Sauce
Some marinara sauces contain surprisingly large amounts of added sugar. For a lower-carb casserole, choose a sauce with little or no added sugar and check the carbohydrate count on the label.
Don’t Overcook the Peppers
You want the peppers tender but still holding their shape. They’ll continue cooking in the oven.
Let It Rest
Those five minutes of resting time make a noticeable difference when serving.
🌟 Delicious Variations
Low Carb Taco Stuffed Pepper Casserole
Replace the Italian seasoning with taco seasoning.
Add cumin and a little chili powder, then top with cheddar and sliced jalapeños.
Cheeseburger Stuffed Pepper Casserole
Use cheddar as the main cheese and add a little mustard to the beef mixture.
Top with diced pickles after baking for a fun cheeseburger-inspired version.
Sausage & Pepper Casserole
Replace half the ground beef with Italian sausage.
Use mozzarella and Parmesan for an extra savory finish.
Mexican-Style Version
Add:
Chili powder
Cumin
Diced green chiles
Monterey Jack cheese
Serve with avocado or sour cream if desired.
Extra Veggie Version
Add mushrooms, zucchini, spinach, or cauliflower rice.
Cauliflower rice works particularly well if you’re missing the texture of traditional stuffed peppers with rice.
🍽️ What to Serve With It
This casserole is hearty enough to be a complete meal, but there are plenty of low-carb sides that pair beautifully with it.
Cauliflower Rice
A great option if you want something that resembles the traditional rice-based version.
Green Salad
A crisp salad with lettuce, cucumber, and a light vinaigrette keeps the meal fresh.
Roasted Broccoli
The crispy edges of roasted broccoli are delicious with the saucy beef mixture.
Garlic Butter Green Beans
Simple, savory, and low in carbohydrates.
Sautéed Zucchini
A quick vegetable side that keeps the whole meal low carb.
🥡 Storage Instructions
Refrigerator
Store leftovers in airtight containers.
Refrigerate for 3–4 days.
Freezer
Let the casserole cool completely before freezing.
Freeze individual portions in airtight freezer-safe containers for up to 2–3 months.
Thaw overnight in the refrigerator before reheating.
Reheating
Reheat individual portions in the microwave until hot.
For a larger portion, cover with foil and warm in a 350°F (175°C) oven until heated through.
📊 Approximate Nutrition Information
Per serving, based on 6 servings:
Calories: 420–470
Protein: 35–40g
Fat: 27–32g
Total Carbohydrates: 13–17g
Fiber: 4–5g
Net Carbohydrates: 9–12g
Nutrition is approximate and will vary depending on the ground beef, cheese, tomato products, and other brands used.
❓ Frequently Asked Questions
Is this casserole keto-friendly?
It can fit into many low-carb or keto eating patterns, but the exact carbohydrate count depends heavily on the tomato sauce and vegetables used. Check your specific ingredients if you’re following a strict carbohydrate limit.
Can I use ground turkey?
Absolutely. Ground turkey is a great leaner alternative to ground beef.
Can I add cauliflower rice?
Yes! Add about 2 cups cooked cauliflower rice to the beef mixture. Cook off excess moisture before assembling the casserole.
Can I use frozen bell peppers?
Yes, although fresh peppers generally provide better texture. If using frozen peppers, thaw and drain them well first.
Can I make this without cheese?
Yes. The casserole will still be flavorful without cheese, although the cheese provides the classic bubbly casserole topping.
Can I use different cheese?
Definitely. Monterey Jack, provolone, Colby Jack, pepper Jack, or Parmesan can all work.
Why is my casserole watery?
The most common reason is excess moisture from the tomatoes or vegetables. Simmer the filling uncovered until some of the liquid evaporates before transferring it to the baking dish.
Can I make it ahead?
Yes. Assemble the casserole, cover tightly, and refrigerate for up to 24 hours. Bake when ready, adding several minutes to the cooking time if it’s cold from the refrigerator.
💚 Final Thoughts
This Low Carb Stuffed Pepper Casserole brings all the best parts of classic stuffed peppers to the table without the rice.
It’s savory, cheesy, colorful, and comforting, with plenty of tender peppers tucked into seasoned ground beef and tomato sauce. The melted cheese on top turns it into the kind of dinner everyone wants to scoop seconds of.
It’s also wonderfully flexible. Add mushrooms, swap the beef for turkey, make it spicy, change the cheese, or stir in cauliflower rice—the basic recipe gives you plenty of room to make it your own.
For busy nights when you want something hearty but don’t want to spend all evening cooking, this casserole is exactly the kind of recipe worth keeping close.