Preheat your oven to 375°F (190°C).
In a large skillet over medium-high heat, brown the ground beef, breaking it apart with a spatula. Cook until no longer pink, about 5-7 minutes.
Add the chopped onion to the skillet and sauté with the beef until the onion is translucent, about 3 minutes.
Stir in the minced garlic, paprika, cumin, salt, and pepper. Cook for another 2 minutes.
Remove the skillet from heat and set aside.
In a separate skillet, heat the olive oil over medium heat. Add the riced cauliflower and sauté for 5 minutes until it starts to become tender.
Pour in the broth, season with salt and pepper, and cover the skillet. Let it steam for about 5 minutes, or until the liquid is absorbed.
Combine the cooked cauliflower rice with the beef mixture, mixing well.
Arrange the bell peppers in a baking dish and spoon the beef and cauliflower rice mixture into each pepper.
Top each stuffed pepper with a generous sprinkle of shredded cheddar cheese.
Bake in the preheated oven for 20-25 minutes, or until the peppers are tender and the cheese is melted and bubbly.
Serve hot and enjoy your Keto Beef Stuffed Peppers with Cauliflower Rice!