01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a mixing bowl, combine softened butter, minced garlic, chopped parsley, and salt until mixture is smooth and homogeneous.
03 - Evenly spread the garlic butter over the surface of each bread slice using a spoon or spatula.
04 - Sprinkle shredded mozzarella and cheddar cheese across the top of each bread slice.
05 - Distribute chopped green chilies or jalapeño over the slices, then add crushed red pepper flakes if increased heat is desired.
06 - Lay prepared bread slices on parchment-lined baking sheet in a single layer.
07 - Place baking sheet in oven and bake for 10 to 12 minutes, until cheese is fully melted, bubbly, and edges are golden brown.
08 - Serve hot and garnish with additional fresh parsley if preferred.