01 - Preheat oven to 400°F. Lightly grease a 9x13-inch baking dish with olive oil or nonstick spray.
02 - In a large mixing bowl, combine the sliced bell peppers and red onion with 1 tbsp olive oil, chili powder, smoked paprika, ground cumin, garlic powder, onion powder, salt, and black pepper. Toss until vegetables are evenly coated.
03 - Slice each chicken breast horizontally through the center without cutting all the way through, then open like a book. Place between sheets of plastic wrap and pound to an even 1/4-inch thickness using a meat mallet or rolling pin.
04 - Divide the seasoned vegetable mixture and shredded Monterey Jack cheese evenly among the flattened chicken cutlets. Lay the filling across the center of each piece, then roll each breast up tightly. Secure with toothpicks to hold the seam closed.
05 - Place the rolled chicken seam-side down in the prepared baking dish. Sprinkle any remaining seasoning blend over the tops of the roll-ups.
06 - Bake for 25 to 30 minutes, until the chicken reaches an internal temperature of 165°F and the cheese is melted and bubbling.
07 - Remove from the oven and discard the toothpicks. Garnish with chopped fresh cilantro and serve alongside lime wedges and sour cream.