Cast-iron, heavy bottomed or nonstick, medium-sized skillet
Ingredients
2slicessourdough bread½-inch thick
2teaspoonsmayonnaise
2teaspoonsunsalted butterdivided
⅓cupgrated aged cheddar cheese(35g)
⅓cupgrated gruyère cheese(35g)
Instructions
Heat a medium skillet over medium heat.
Spread one side of each piece of bread with the mayonnaise.
Add 1 teaspoon of butter to the skillet. Once it melts, place one slice of bread mayonnaise side down in the skillet. Top with the cheeses (mound them up!), then the other slice of bread, mayonnaise side up.
Cook for 3 to 4 minutes until golden brown. Add the remaining 1 teaspoon of butter to the skillet and let it melt.
Flip the sandwich into the freshly melted butter, then move it to the center of the pan. If the cheese is still mounded up on the inside, press down on the top of the bread with the back of the spatula to flatten it slightly.
Cook for 3 to 4 more minutes, until the bottom piece of bread is golden brown.
Place the sandwich on a wire rack or plate and let it sit for 2 minutes before slicing.
Video
Notes
Don’t let the skillet get too hot. Slower cooking is better to melt the cheese in the center and toast the bread without burning it.
Grate your own cheese. Pre-shredded cheese contains anti-clumping agents that make it more difficult to melt. For ultimate ooey-gooey cheesiness, use freshly grated cheese.
Cheese swap: You can use a slice of cheese in place of shredded cheese to save time. However, just like with preshredded cheese, presliced cheese isn’t always the gooiest when melted.
Adjust the quantity of cheese. Depending on the size of the bread, use more or less grated cheese than I used in this recipe so it fits well on the bread and you have a generous amount of cheese in the sandwich.