Preheat oven to 375°F. Slice the tops off the bell peppers and remove seeds.

In a skillet, heat olive oil and sauté diced onion until translucent. Add ground beef and cook until browned.

Mix cooked rice, diced tomatoes, paprika, cumin, and black pepper into the beef mixture.

Stuff the peppers with the filling mixture and place them in a baking dish.

Bake in the preheated oven for 40 minutes until peppers are tender and filling is cooked through.