Preheat the oven to 425°F. Line a baking sheet with foil.
Slice French bread in half. In a small bowl, stir 4-6 Tablespoons softened butter and 3/4 teaspoon garlic powder until smooth. Add cheese and parsley, if desired. Spread garlic butter mixture evenly over the cut side of the bread halves. Place on the baking sheet.
Bake 5 to 10 minutes, or until lightly browned around the edges. Slice each half into 6 and serve while hot.
Notes
Storage: If you have leftovers, just store it in a zip-top plastic bag at room temperature. I wouldn't recommend storing in the fridge, as it usually makes it stale (it draws the moisture out of the bread). It will keep for about 2 to 3 days if stored in a plastic bag at room temperature.Freeze: If freezing a whole half loaf, wrap tightly in aluminum foil and place in a zip-top freezer bag. You can also add slices to a zip-top bag and freeze that way. To reheat, place on a baking sheet and warm in oven for a few minutes.Make Ahead and Freeze: Spread the garlic butter on the bread, wrap tightly in plastic wrap then foil and freeze for up to 3 months. When ready to bake, unwrap and bake straight from frozen at 425°F for 10 to 15 minutes.