01 - Preheat oven to 400°F. Position rack in the center of the oven.
02 - In a mixing bowl, combine diced tomatoes, red onion, cilantro, minced jalapeño, garlic, lime juice, kosher salt, and black pepper. Stir gently and set aside to allow flavors to meld.
03 - Lightly coat a 9x13-inch baking dish with olive oil, ensuring even coverage across the bottom and sides.
04 - Place chicken breasts in the prepared dish. Sprinkle both sides evenly with ground cumin, chili powder, and paprika, pressing gently to adhere the spices.
05 - Spoon the prepared salsa fresca evenly over each chicken breast, distributing the mixture so every piece is well covered.
06 - Top each chicken breast generously with shredded Monterey Jack or mozzarella cheese, spreading to the edges.
07 - Bake uncovered for 25 to 30 minutes, until the chicken reaches an internal temperature of 165°F and the cheese is golden and bubbly.
08 - Remove from oven and let rest for 5 minutes before serving. Garnish with additional fresh cilantro if desired.