Slice bread almost all the way through. Add butter in between each slice carefully without pulling apart. Add as much or as little as you like.
Add shredded cheddar cheese in between each slice. Again, being careful not to pull the bread apart. Add as much or as little as you like.
Repeat with shredded mozzarella cheese. Add as much or as little as you like. Sprinkle any extra you want on top.
Sprinkle onion/garlic powder on top of the mozzarella cheese.
Bake in preheated oven for 5-10 minutes, depending on how you like your bread.
Notes
ITEMS/INGREDIENTS USED IN RECIPE - If you are interested in any of the items I may have used (or are similar to the items I used) in making this recipe, I have listed all or some of them above within the post. NOTE: These links are affiliate links of which I receive a small commission from the sale of certain item. This does not affect your price, it remains the same.