Mix the three cheeses together in a bowl. Spread a thin layer of mayonnaise on the outside of both bread slices. Place one slice mayo-side down, add half the cheese, then spread 2 tablespoons of Angry Rooster Spicy Chili Crunch over it. Add the remaining cheese and top with the second slice of bread, mayo-side up.
Melt the butter in a pan over low heat. Add the sandwich, cover with a lid, and cook for 3–4 minutes to let the cheese melt. Flip and cook uncovered for another 2–3 minutes until both sides are golden and crispy.
Let the sandwich rest on a wire rack for 1 minute, then cut diagonally and serve while the cheese is still melted.
