- 1/4 cup butter
- 4 apples – peeled, cored, and sliced
- 1 onion, cut into matchstick-sized pieces
- 1/4 cup brown sugar
- 1 pinch ground cinnamon, or to taste (optional)
Melt butter in a skillet over medium-high heat; cook and stir apples, onion, brown sugar, and cinnamon in the melted butter until onions are translucent and sauce is slightly reduced, 15 to 20 minutes. Cool before serving.