Preheat the oven on broil or the toaster oven on the toast setting.
Place the bread on a baking sheet. Spread the garlic butter on each half or slice. If you don’t have garlic butter, spread with butter and sprinkle with garlic salt.
Add a slice of tomato to each piece, then drizzle each tomato with the vinegar and olive oil. Place the provolone on top of each tomato slice, then sprinkle Parmesan over top.
