01 -
Place bread slices in a cold frying pan. Spread butter generously on the top side of each bread slice, then flip them so they are butter side down, ready for toppings.
02 -
On each slice of bread in the pan, layer 3-4 thin slices of mozzarella cheese. Follow with a heaped tablespoon of pesto. Distribute sun-dried tomatoes and bacon pieces over the pesto. Add another layer of mozzarella cheese for extra gooeyness.
03 -
Top each assembly with another slice of bread to create a sandwich. Press down gently to ensure the fillings are contained. Spread butter on the top side of the bread slices to prepare them for grilling.
04 -
Turn the heat to medium and allow the pan to slowly warm up. Grill both sides of the sandwiches until golden brown, flipping as needed. The cheese should be completely melted through the center.
05 -
Remove sandwiches from the pan and let cool momentarily before serving.