I don't know about you, but one of my favorite comfort foods is a grilled cheese sandwich. Cracker Barrel makes one of the best. After some experimentation, we think this recipe is spot on.
Butter your sourdough bread.
Place one slice of colby and provolone cheese on top of the buttered bread.
Cover with a layer of shaved parmesan cheese.
Add another slice of colby cheese on top of the parmesan cheese.
Top with your second slice of buttered slice of sourdough bread.
Grill on medium heat until melted, flipping halfway during cooking.