01 -
Slice the bread into half-inch pieces. Grate both types of cheese. Heat up the skillet on low.
02 -
On one side of each bread slice, spread a teaspoon of mayo evenly.
03 -
Add butter to the skillet, put a slice of bread mayo-side down, pile on grated cheese, and place the second slice mayo-side up on top.
04 -
Cover the skillet and cook for 2 to 3 minutes, until the bottom is golden and crispy.
05 -
Carefully flip the sandwich over, cover it again, and cook another 2 minutes until the cheese melts completely and the second side is toasted.
06 -
Slice it diagonally and dig in while it’s still gooey and hot.