Preheat the oven to 375ºF. Lightly grease a baking dish with a pat of butter.

Season the chicken breasts with salt and pepper to taste. Arrange the chicken in a single layer in the prepared baking dish and set aside.

Add butter to a skillet and melt over medium heat. Stir in the garlic and cook over medium heat for 4 minutes or until lightly browned, stirring very frequently. DO NOT burn the garlic. Stir in the rosemary and remove from heat.

Pour the prepared garlic butter over the chicken breasts.

Bake for 30 to 32 minutes or until the chicken's internal temperature registers at 165ºF.

Sprinkle with cheese and cook for an additional 3 minutes or until the cheese is melted.

Remove from oven and let stand for about 5 minutes. Transfer the chicken to serving plates, then spoon garlic butter sauce over the chicken and serve.