
Preheat oven to 400F and line a large baking tray with parchment or aluminum foil. Lightly spray with oil.
Spray oil in a medium nonstick skillet over medium heat.
Add onion, garlic, and cilantro and sauté about 2 minutes, add ground turkey, salt, garlic powder, cumin and cook meat for 4 to 5 minutes until meat is completely cooked through. Add 1/4 cup of tomato sauce and chicken broth, mix well and simmer on medium for about 5 minutes, remove from heat.
Meanwhile, arrange mini peppers in a single layer, cut-side up close together.
Fill each with cooked ground turkey mixture, then top with shredded cheese and jalapeño slices, if using.
Bake 8 to 10 minutes, until cheese is melted.
Remove from oven and top with black olives, sour cream, and cilantro. Serve immediately.