
Preheat the 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 for about 2 minutes, then add ground turkey, salt, garlic powder, and cumin. Cook the meat for 4 to 5 minutes until completely cooked. Mix in 1/4 cup of tomato sauce and chicken broth, then simmer on medium for about 5 minutes before removing from heat.
Meanwhile, arrange the mini peppers in a single layer, cut-side up and close together.
Stuff each pepper with the cooked ground turkey mixture, then sprinkle with shredded cheese and jalapeno slices, if desired.
Bake for 8 to 10 minutes, until the cheese has melted.
Take out of the oven and top with black olives, sour cream, and cilantro. Serve right away.