Preheat your oven to 400°F (200°C). Gather your tools, including a baking sheet lined with parchment paper, a cutting board, and a sharp knife or mandolin for slicing the onions.

Slice the yellow onions thinly, about 1/8 inch thickness. Set them aside.

Sprinkle a generous layer of shredded Parmesan cheese on the parchment-lined baking sheet.

Carefully lay the sliced onions over the Parmesan in a single, even layer.

Lightly coat the onion slices with olive oil using a brush.

Sprinkle sea salt, garlic powder, smoked paprika, and black pepper over the onions.

Bake in the preheated oven for 18-20 minutes until golden and crispy.

Allow the chips to cool slightly before cutting them into chip shapes.