Preheat oven to 350°F (177°C). Line a large baking sheet with parchment paper.

Spread 1.5 cups shredded cheese into a thin, even layer on the parchment-lined baking sheet.

Arrange the onion rings on top of the cheese in a single layer without overlapping.

Sprinkle the remaining cheese on top of each onion ring to create a light crispy layer.

Bake for 30-35 minutes, checking frequently after 20 minutes to prevent burning.

Once most of the cheese is lightly golden, remove the baking pan from the oven but do not turn off the oven.

Allow the chips to cool for about 5-10 minutes, then carefully flip the sheet of onion chips over.

Return to the oven and bake for an additional 3-5 minutes to crisp up any sections of cheese that aren't fully golden brown.

Remove chips from oven and let cool for about 10 minutes. Break into smaller pieces or cut into individual onion chips. Serve while warm.