Shingle sliced meatballs and 1 slice provolone cheese between 2 pieces of toast.
Melt 1 tablespoon of butter in a hot pan on medium high heat. Cook sandwich on one side until bread is toasted and warm, about 3 minutes. Add 1 tablespoon butter to pan and flip sandwich. Cook opposite side for 3 additional minutes.
Repeat steps one and two until all sandwiches are made.