01 -
Heat a sandwich maker or non-stick skillet over medium-high setting.
02 -
Place one slice of cheese on one slice of whole grain bread.
03 -
Arrange avocado slices evenly over the cheese, leaving a border around the edges.
04 -
Top avocado with the second slice of cheese and distribute bacon evenly over the cheese.
05 -
Position the remaining bread slice on top to enclose the filling.
06 -
In a small bowl, combine the melted butter and mayonnaise. Spread half of the mixture over the top of the sandwich.
07 -
Place sandwich into the preheated sandwich maker or skillet, buttered side down.
08 -
Spread the remaining butter-mayo mixture over the unbuttered side.
09 -
Grill for 2–5 minutes in the sandwich maker or 3 minutes per side in a skillet, until bread is golden brown and cheese is melted.
10 -
Remove from heat, cut in half, and serve immediately while hot.