Start by peeling and cubing your sweet potatoes, finely chopping the onion, and slicing the apples. This will ensure everything cooks evenly and quickly.

In a large skillet over medium heat, melt 1 tablespoon of butter. Add the onions and sauté until they are translucent, about 3-4 minutes.

Stir in the diced sweet potatoes, adding salt, pepper, and cinnamon. Cover and let it cook for 10-12 minutes until tender and slightly golden.

Toss in the sliced apples along with the remaining 2 tablespoons of butter. Cook uncovered for an additional 5-7 minutes until the apples begin to caramelize.

Gently stir the mixture to meld the flavors together. Taste and adjust the seasoning if needed before serving hot and fresh.