- 2 tablespoons unsalted butter
- 2 slices white sandwich bread
- 2 slices Cheddar
- 1/8 small red onion, thinly sliced
- 1/2 small avocado, thinly sliced
- Melt the butter in a small skillet over medium-low heat. Form a sandwich with the bread, cheese, onion, and avocado.
- Cook the sandwich, covered, until the bread is toasted and the cheese is melted, 2 to 3 minutes per side.