Heat a cast iron or non-stick skillet over medium-high heat. Generously butter one side of each slice of bread and sprinkle a bit of garlic salt over the buttered sides.
Place two slices of bread, buttered side down, into the hot pan.
Sprinkle half of the cheese on each slice. Top each slice with the roughly chopped chile, then sprinkle the remaining cheese over the chiles. Gently press the other slice of bread down onto the sandwiches to close them up, buttered side up.
Let the sandwich fry for about 2-3 minutes, then carefully flip the sandwich over, and cook for another 2-3 minutes, or until the bread is golden brown and crisp, and the cheese is melted.