Add the diced onion, bell peppers, and jalapeño to the turkey. Cook, stirring occasionally, for an additional 6 to 8 minutes until softened. Add the minced garlic, 2 tablespoons of chili powder, 1 tablespoon of cumin, and ½ teaspoon of cayenne powder to the pot. Stir to cover with the spices and cook for 1 minute until fragrant. Taste and add salt and pepper if needed.