Get your oven ready by preheating to 400°F (200°C). Lightly grease a 9x13 inch casserole dish.
In a mixing bowl, gently stir together the diced cherry tomatoes, chopped onion, jalapeño, fresh cilantro, lime juice, and 1/4 teaspoon of salt. This is your vibrant salsa base!
Spread the diced chicken breast evenly in the prepared casserole dish. Sprinkle generously with cumin, paprika powder, garlic powder, red chili pepper flakes, and black pepper, ensuring all pieces are well-coated for maximum flavor.
Carefully spoon your fresh tomato mixture over the seasoned chicken. Finish by scattering the shredded mozzarella evenly on top.
Bake in the preheated oven, uncovered, for 25 to 30 minutes, or until the chicken is thoroughly cooked through and the cheese is bubbly and golden.
For an extra burst of freshness, sprinkle with more chopped cilantro right before serving. Enjoy your healthy meal!