My daughter's recipe. Yes, you can use other bread. But it won't be as good, just sayin'!
Sourdough bread boule (small makes 4 good sized slices)
Preheat oven to 400 degrees Fahrenheit.
Line a baking sheet with parchment paper. Slice bread into 4 equal slices, lay on parchment. Butter each slice generously. Add garlic powder and onion powder. Top with desired shredded cheese. Sprinkle paprika, chili powder, pepper & just a little salt. We never measure, just sprinkle evenly with one pass. Bake for about 10-15 minutes, until cheese is melted and it is your desired crispiness.