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| whole-wheat bread: 2 slices |
| unsalted butter: 2 tsp |
| swiss cheese: 2 slices |
| sliced ham: 2 slices |
| regular mayonnaise: 1 tsp |
| mustard powder: 1 tsp |
Credit: allrecipes.com
Preheat a skillet over medium-high heat.
Spread one side of each slice of bread with 1 teaspoon butter. Place one slice, butter-side down in the hot skillet. Top with Swiss cheese and ham. Spread the unbuttered side of the second slice of bread with mayonnaise and mustard; place it, butter-side up on top of the sandwich. Cook until the sandwich is golden brown and the cheese is melted, about 3 minutes per side.