Carefully slice the tops off the bell peppers and remove the seeds and inner membranes. Place the peppers upright in a baking dish, ensuring they are stable.
In a medium skillet, heat the olive oil over medium heat. Add the ground turkey and cook, breaking it apart with a spatula, until browned and cooked through, approximately 5-7 minutes.
Stir in the taco seasoning and the diced tomatoes, incorporating everything well. Allow the mixture to simmer on low for an additional 2-3 minutes to meld the flavors.
In a large mixing bowl, combine the cooked brown rice, rinsed black beans, corn, and half of the shredded cheddar cheese. Mix well, then add the turkey mixture from the skillet and stir until evenly combined. Season with salt and pepper to your taste preference.
Generously stuff each bell pepper with the turkey and rice mixture, pressing down slightly to ensure they are well-filled.
Sprinkle the remaining cheddar cheese over the top of each stuffed pepper for an extra cheesy layer.
Pour a small splash of water into the bottom of the baking dish to create steam during cooking, then cover the dish with aluminum foil. Bake in the preheated oven for 30 minutes.
After 30 minutes, carefully remove the foil and continue baking for an additional 10-15 minutes, until the peppers are tender and the cheese is melted, bubbly, and golden brown.
Allow the stuffed peppers to cool for a few minutes before serving. Garnish with freshly chopped cilantro and display avocado slices alongside for a creamy, delicious pairing.
Notes
Arrange the stuffed peppers on a colorful platter and serve with avocado slices for a delicious pairing.