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