Cut the tops off the mini bell peppers, then cut in half and remove the seeds and veins. Place on the prepared baking sheet and preheat oven to 400 degrees F.
In a large bowl, add ground chicken, chili powder, cumin, salt, garlic powder, onion powder, paprika and oregano. Mix together until the seasoning is well combined with the meat.
Heat a large skillet over medium-high heat. Add in the olive oil and the seasoned ground chicken. Sauté until meat is fully cooked, about 8 to 10 minutes. Remove from heat.
Spoon the cooked ground chicken onto the mini bell peppers. Top the peppers with shredded cheese and bake in oven for 10 minutes.
Remove from oven and top with cilantro, onions, avocados and any other toppings you'd like. Serve immediately.