For substitutions, try vegan butter, gluten-free bread, or dairy-free cheeses if needed. You can prep the garlic butter in advance and store in the refrigerator for up to three days. To store leftovers, cool completely and keep in an airtight container; reheat in a skillet for the crispiest results. If the cheese isn’t melting, lower the heat and cover briefly with a lid, or use pre-shredded cheese to speed up melting. Avoid high heat to prevent burning.