Pre-heat skillet
Heat a cast-iron or heavy non-stick pan over medium-low.
Butter bread
Spread softened butter edge-to-edge on the outsides of all bread slices.
Assemble
Lay one slice (butter-side down) in the pan. Cover with half the cheddar, then Gruyère, then the rest of the cheddar. Top with the second slice, butter-side up.
Grill, low & slow
Cook 3–4 min until the bottom is deep-golden. Flip once. Press gently and cook another 3–4 min until cheese is fully melted.
Rest & serve
Transfer to a board, rest 1 min (cheese sets), slice, and enjoy.
2 servings
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.