Preheat oven to 425°F and grease a pan or baking sheet (if planning to slice peppers in half).
Mix meat, rice/quinoa, pineapple, onion, barbecue sauce, cilantro salt, garlic powder and (optional) jalapeno together until just combined.
Remove the tops of the bell peppers and the seeds inside. You may also cut the peppers in half lengthwise. Gently stuff peppers with meat filling.
Cook peppers for 45 minutes. With 20 minutes left on the clock, remove pan from oven, sprinkle cheese if desired, then return to the oven.
Use a meat thermometer to verify filling is fully cooked and enjoy while hot!