Beef & Cauliflower Rice Keto Stuffed Peppers

These keto stuffed peppers are a fantastic twist on classic stuffed peppers, swapping out the traditional rice for flavorful cauliflower rice. They keep all the tasty favorites—seasoned ground beef, rich marinara sauce, and melty cheese—wrapped in tender bell peppers. This recipe makes eight stuffed pepper halves, enough for about four people, and you’ll have dinner on the table in under an hour using simple ingredients you likely already have.

This recipe reinvents classic stuffed peppers for a low-carb lifestyle by swapping out rice for cauliflower rice, but still delivers that satisfying blend of seasoned ground beef, marinara sauce, and gooey melted cheese. It yields eight bell pepper halves—perfect for a family of four—and it all comes together quickly with basic pantry staples and everyday kitchen tools.

You’ll follow an easy process: first, the peppers get a quick bake to soften just enough, then you brown the filling on the stove before stuffing the peppers and finishing everything off in one baking dish until the cheese is perfectly melted and bubbly. Stick with me, and I’ll walk you through the full ingredient list, step-by-step directions, helpful tips for spot-on texture, plus some fun swaps for different proteins, cheeses, or diets.

Why You’ll Love It

• Low-carb magic: we use cauliflower rice instead of regular rice to cut down carbs but keep that satisfying texture. If you want another cauliflower-forward keto dinner, try our Keto Buffalo Chicken Cauliflower Casserole.
• Kid- and family-approved: familiar flavors of beef, tomato sauce, and cheese everyone loves.
• Prep-friendly: you can get parts done ahead of time for quick assembly later.
• One-dish wonder: baking the peppers in a single pan means less mess to clean up afterward. For another effortless sheet-pan meal, check out keto sheet-pan sausage and peppers.

Ingredients and Quantities

• 4 large green bell peppers
• 1 tablespoon olive oil
• 1 1/4 pounds ground beef
• 1/2 cup diced yellow onion
• 2 cloves garlic, minced
• 2 cups cauliflower rice
• 1 cup no-sugar-added marinara sauce
• 1 teaspoon Italian seasoning
• 3/4 teaspoon salt
• 1/4 teaspoon black pepper
• 1 1/2 cups shredded mozzarella cheese
• 1/4 cup grated Parmesan cheese
• 2 tablespoons chopped fresh parsley

Step-by-Step Directions

1. Preheat oven to 375°F.
2. Cut each bell pepper in half lengthwise and scoop out seeds and membranes.
3. Place pepper halves in a 9×13-inch baking dish and brush with olive oil.
4. Bake empty pepper halves for about 10 minutes, then remove from oven.
5. Heat a skillet over medium-high heat and brown ground beef with diced onion, breaking into small crumbles, about 7 minutes.
6. Add minced garlic and cook about 30 seconds.
7. Stir in cauliflower rice and cook about 3 minutes to soften.
8. Add marinara sauce, Italian seasoning, salt, and black pepper; reduce heat and simmer for 3 minutes.
9. Divide the beef and cauliflower mixture evenly among the pepper halves.
10. Top each stuffed pepper with shredded mozzarella and sprinkle grated Parmesan.

11. Bake the assembled peppers 20–25 minutes until peppers are tender and cheese is melted, bubbly, and slightly golden.

    

12. Remove from oven and sprinkle chopped fresh parsley on top.

Tips for Best Results

• Using frozen cauliflower rice? Make sure to thaw it first and squeeze out any extra moisture, or cook it a little longer so your filling isn’t watery.
• If you want a leaner filling, drain any excess fat from your browned beef before mixing it with the other ingredients.
• Prefer really soft peppers? Bake the pepper halves for 15 minutes initially instead of just 10 before stuffing them—this pre-bake approach also works for stuffed zucchini, as in these Lasagna Zucchini Boats.
• When watching your salt intake, use a low-sodium marinara sauce and taste your filling before adding more seasoning.
• Let these keto stuffed peppers rest for around 5 minutes after baking so the filling sets up nicely—just as a low-carb bake like Zucchini Casserole with Ground Beef benefits from a brief rest—and they’re easier to serve without falling apart.

Alternative Fillings and Swaps

• Swap proteins: ground turkey, chicken, pork, or even plant-based ground meat work beautifully if you want a different twist or need a vegetarian or vegan option (just swap in dairy-free cheese).
• Meatless option: try cooked lentils with chopped mushrooms and extra veggies instead of beef for a nourishing vegetarian filling; you can also swap the cauliflower rice for finely sliced sautéed cabbage—this easy garlic butter cabbage noodles method works well when chopped small.
• Mix up the cheese: switch out mozzarella for cheddar, pepper jack, or a cheese blend depending on your taste preferences.
• Add some spice: if you like heat, toss in red pepper flakes, a pinch of cayenne, or chopped jalapeños to the filling.
• Change the colors: use red or yellow bell peppers instead of green for a sweeter, more colorful presentation.

Storage, Freezing & Reheating

• To store leftovers, keep cooled stuffed peppers in an airtight container in the fridge for 3 to 4 days.
• Reheat them in the oven at 350°F for 12 to 18 minutes until thoroughly warmed. Covering with foil helps keep the cheese from browning too much.
• If you’re short on time, microwave single portions for 1½ to 3 minutes—just watch so they don’t overcook.
• You can freeze these stuffed peppers for 2 to 3 months. Let them cool completely, then wrap well or place in freezer-safe containers. Thaw overnight in the fridge before reheating. Or, freeze them unbaked and bake straight from thawed or partially frozen, adding 10 to 20 minutes to baking time if they’re still cold.

Frequently Asked Questions

• Q: Is this recipe truly keto? A: Yes! Using cauliflower rice keeps the carb count low, so as long as you choose a low-sugar marinara, this fits perfectly into ketogenic or low-carb diets.
• Q: Can I use frozen cauliflower rice? A: Absolutely. Just thaw it first and drain any extra water, or cook it a little longer in the skillet so the filling stays nice and thick.
• Q: Can I prepare this recipe ahead of time? A: Definitely. You can make the filling and par-bake peppers in advance, then assemble and refrigerate for up to a day before baking. It also freezes well, cooked or uncooked.
• Q: How do I avoid soggy peppers? A: Pre-baking the peppers as described is key, plus draining excess fat from your beef and keeping sauce quantities balanced helps prevent sogginess.
• Q: Can I cook these with whole peppers instead of halves? A: Yes! Just par-bake whole peppers for 10 to 15 minutes, then stuff and bake longer until tender. Adjust baking time accordingly.