To start, peel the apples and then cut each apple into quarters. Slice each quarter into 4 pieces.
Next, melt the butter over medium-high heat. Once the butter has almost melted, add the brown sugar, followed by the apples. Cook and toss the apples a few times until they are nicely caramelized on all sides.
Note: You can also add a pinch of cinnamon, if desired.