Arrange two slices of bread on a cutting board and layer provolone cheese slices evenly on one slice, covering the entire surface.
2 slices white bread slices
Spread softened butter evenly over one side of each bread slice using a knife or spatula.
2 slices white bread slices
Heat a skillet over medium heat until hot, then place one buttered bread slice, buttered side down, into the pan.
2 slices white bread slices
Top the bread in the skillet with the second slice, buttered side up, creating a sandwich. Cook for about 2-3 minutes or until the bottom is golden brown and crispy, then flip with a spatula and cook the other side for an additional 2-3 minutes until golden brown and the cheese is melted.
2 slices white bread slices
Remove the sandwich from the skillet once both sides are golden and crispy, and the cheese has melted inside. Let it rest for a minute before slicing if desired.