- Preheat your oven to 350°F and prepare a large baking sheet for the bread. 
- Cut the bread into a grid pattern by slicing it 3/4 inch thick, careful not to slice through to the bottom. 
- Mix the melted butter, cheddar cheese, parmesan cheese, minced garlic, and a bit of salt in a bowl. 
- Spread the cheese mixture between the cuts in the bread, ensuring it seeps down to the bottom. 
- Wrap the loaf in foil and bake on the prepared sheet for about 15 minutes. 
- Unwrap the foil, top with chopped green onion, and bake for an additional 5 minutes.