Coat Grilled Cheese In One Condiment Combo For An Instant Flavor Boost

Grilled cheese is a classic comfort food, but you can take it to gourmet heights with a simple upgrade. Instead of spreading butter on the outside of the bread, try using mayonnaise — and, while you're at it, mix in some mustard with the mayo for an extra punch. This trick can help you create the perfect crispy crust and adds a delicious tang to every bite.

Mayonnaise is an oil-based fat, which gives it a higher smoke point than butter. This means it browns more evenly and is less likely to burn before the cheese inside melts. When you spread mayo on the outside of the bread, it crisps up beautifully, creating a golden, crackly crust that's almost impossible to achieve with butter.

Mix equal parts mayonnaise and mustard before spreading it on the outside of the bread (in other words, the side that will hit the pan). Yellow mustard adds a mild tanginess, while Dijon or spicy mustard can introduce a more robust flavor, depending on the exact variety or brand you use. If you really want to go out, try some fancy flavors like Stonewall Kitchen's set of four varieties, including Maine maple Champagne mustard and caramelized onion mustard, if you really want to go all out. The mustard not only complements the richness of the cheese but also enhances the sandwich with a zesty, slightly acidic note.

First, be sure to choose the right bread: A sturdy bread like sourdough or rye holds up better than softer sandwich bread. The mayo-mustard mixture works well on all types, but heartier bread adds structure and extra crunch. You can even use an English muffin if that's all you have in the kitchen. Be sure to use medium-low heat, too, which allows the bread to crisp without burning and gives the cheese time to melt perfectly.

As for the cheese, while classics like cheddar or American cheese work beautifully, consider mixing it up with gruyere, gouda, or mozzarella for a more sophisticated sandwich. A combination of cheeses can also bring depth to the flavor. Add extras like caramelized onions, sliced tomatoes, hot honey (already a grilled cheese fave), or crispy bacon to elevate your sandwich further. These ingredients pair wonderfully with the tangy mayo-mustard crust.

Switching from butter to mayo—and adding mustard—transforms the texture and taste of your grilled cheese. The result is a crispy, golden-brown exterior with a rich, flavorful bite. Whether you're making a quick lunch or serving up a late-night snack, this method will surely impress.