01 - Preheat oven to 400°F. Toss sweet potato slices with olive oil and arrange on a baking sheet in a single layer. Bake for 15 minutes, or until edges are golden and chips are lightly crisped.
02 - Remove baking sheet from oven. Evenly distribute black beans, corn, and shredded cheese over the baked sweet potato chips.
03 - Return baking sheet to the oven and bake for an additional 5 to 7 minutes, until the cheese is fully melted and bubbly.
04 - Remove from oven. Spoon salsa over the nachos and dollop with sour cream. Serve immediately while hot.