1. Preheat oven to 475° and lightly spray a baking dish (one that has an oven-safe top) with avocado oil spray
2. Cut tops off the bell peppers and carefully remove the membranes/seeds.
3. Place the peppers in the prepared baking dish arranged about 2 inches apart and place the tops back on the empty peppers.
4. Cover the baking dish with its top and bake peppers for 15 minutes, then remove from the oven (but leave the oven on) and set aside.
5. Spray a skillet with avocado oil spray and heat.
6. Once heated, sauté the minced onion and garlic until translucent and fragrant (~3-5 minutes).
7. Add the ground beef and seasonings and fully cook.
8. Stir in tomatoes, and beans and cook 3 to 4 minutes until heated through, stirring occasionally.
9. Remove pepper tops and add filling.
10. Bake at 475° F for 8-10 minutes or until bell peppers are near your preferred tenderness.
11. (skip this step is omitting the cheese) Top with cheese and put peppers back in the oven one final time. Once the cheese has melted, remove from the oven and carefully serve.