Cut the tops off of the bell peppers, then scrape out the seeds and white pith. Save the pepper tops and set them aside.
3. Step
In a medium mixing bowl, combine all the remaining ingredients, season with salt and pepper, and stir together so that everything is thoroughly mixed.
4. Step
Divide the beef mixture in half and stuff it into the peppers, then place the tops of the peppers back on top.
5. Step
Transfer the peppers to a baking sheet or oven-safe skillet, then bake in the preheated oven until the meat is cooked through and the peppers are soft and starting to shrivel, 40 to 45 minutes.
