01 -
Set oven to 400°F. Lightly coat a 12-cup muffin tin with cooking spray.
02 -
In a large bowl, whisk together melted butter, garlic powder, kosher salt, and black pepper.
03 -
Fold in grated Parmesan and Gruyere cheese until thoroughly combined.
04 -
Add sweet potato rounds to the bowl and gently toss to coat each slice uniformly with the butter-cheese mixture.
05 -
Layer coated sweet potato slices into each muffin cup, stacking just above the rim to account for shrinkage during cooking.
06 -
Cover muffin tin tightly with aluminum foil and place on a baking sheet. Bake for 30 minutes.
07 -
Remove foil and continue baking for an additional 30 to 35 minutes until tops are deep golden and crisp, and potatoes are fork-tender.
08 -
Allow to cool for 5 minutes, then loosen each potato stack by running a butter knife around the edges.