01 -
Evenly apply 1 tablespoon of sun-dried tomato pesto to one side of each bread slice.
02 -
Place one slice of mozzarella cheese atop the pesto on a bread slice, then cover with the second slice, pesto side down.
03 -
Heat a skillet over medium heat, then melt 1 tablespoon of butter until sizzling.
04 -
Place the sandwich in the skillet, cooking each side for 3 to 4 minutes until golden brown and the cheese is fully melted.