- 8 minutes
- 10 minutes
- In a small bowl, mix together the mayonnaise and spicy mustard.
- Heat a cast iron skillet over medium heat. Melt the butter.
- Spread the mustard mayonnaise mixture on the slices of bread. Add 2 slices of each type of cheese to each sandwich.
- Place the sandwiches in the preheated skillet. Cook on both sides until browned and the cheese is nicely melted.