Preheat the oven to 375°F (190°C).
In a small mixing bowl, combine 8 ounces full-fat cream cheese (softened), ½ tablespoon roasted garlic paste, 1 cup shredded mozzarella cheese, and 1 cup finely grated parmesan cheese; stir until fully combined and smooth.
Place 4 boneless, skinless chicken breasts in a 9×13-inch baking dish in a single layer.
Sprinkle ¾ teaspoon coarsely ground black pepper and ½ teaspoon garlic salt evenly over the chicken breasts.
Spread the cheese mixture over the top of each chicken breast so they are fully coated.
Bake uncovered for 40–45 minutes, until the cheese topping is browned and bubbly and the chicken reaches an internal temperature of 165°F (74°C).
Remove from the oven and let the chicken rest for about 5 minutes before serving.