Preheat oven to 400 degrees F.
In a saute pan, add ground beef, garlic, salt, and pepper. Cook until beef is browned. Add in diced tomatoes and oregano. Stir well.
Cut bell peppers in half and remove the seeds. Place into a baking dish and fill with ground beef mixture.
Bake for 20 minutes or until peppers are roasted and soft. Remove from oven and top with mozzarella cheese and pepperoni.
Broil for 5 minutes on high or until cheese is melted and pepperoni sweats.
Calories: 478kcal | Carbohydrates: 11g | Protein: 36g | Fat: 32g | Saturated Fat: 15g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 12g | Trans Fat: 1g | Cholesterol: 126mg | Sodium: 1084mg | Potassium: 704mg | Fiber: 3g | Sugar: 6g | Vitamin A: 4248IU | Vitamin C: 155mg | Calcium: 327mg | Iron: 4mg