Preheat oven to 400 degrees Fahrenheit.
Line a baking sheet with parchment paper and arrange 3-4 chicken breasts evenly on the pan.
In a small bowl, mix together 3 tablespoons melted butter, 3 minced garlic cloves, and 1 packet ranch seasoning mix until well combined.
Brush the butter and ranch mixture generously over each chicken breasts, making sure that they are well coated.
Sprinkle ½ cup grated parmesan cheese, and ½ cup grated cheddar cheese evenly over the top of the chicken.
Bake in a preheated oven for 25 minutes, or until the chicken is fully cooked and the juices run clear (internal temp of 165 degrees F).
Remove from the oven and serve.