01 -
Preheat a skillet or air fryer to medium heat (370°F for the air fryer).
02 -
Cook the bacon until crispy, then brush with maple syrup during the last 2 minutes of cooking.
03 -
Grate the cheddar, smoked applewood, and mozzarella cheeses. Mix together in a bowl.
04 -
Generously butter one side of each slice of sourdough bread.
05 -
Layer the cheese mixture and maple bacon between the slices of bread, keeping the buttered sides facing out.
06 -
Cook in a skillet for 3-4 minutes per side on medium-low heat, until golden brown and the cheese is melted.
07 -
If using an air fryer, cook for 3-4 minutes, flipping halfway through.
08 -
Let the sandwiches cool for 2 minutes before cutting and serving.