Prep the ingredients by washing and chopping vegetables.
Heat a skillet over medium heat and add 1 tablespoon of butter.
Assemble the sandwich by layering cheese, veggies, and more cheese between two slices of bread.
Spread the remaining butter on the outside of the bread.
Place the sandwich in the skillet and cook for 3-4 minutes.
Flip the sandwich carefully and cook for another 3-4 minutes until both sides are golden and the cheese is melted.
Remove from heat and let it cool for a minute before slicing.