01 -
Slice the mozzarella cheese into thin pieces and pat dry with a paper towel. Chop the sun-dried tomatoes and slice the cooked bacon strips into small pieces.
02 -
Arrange four slices of sourdough bread on a flat surface. Spread one tablespoon of pesto over each slice. Layer sliced mozzarella evenly, followed by chopped sun-dried tomatoes and bacon pieces. Top each with the remaining bread slices.
03 -
Spread a thin, even layer of butter on the outer side of each sandwich. Ensure the butter covers edge to edge for even browning.
04 -
Preheat a large nonstick skillet or griddle over medium heat. Place sandwiches buttered side down and cook for 3-5 minutes per side, pressing gently, until crisp and golden brown and cheese is fully melted.
05 -
Remove from heat, let stand for 2 minutes, then slice in half and serve immediately.