1cupshredded sharp cheddar cheeseor a mix of cheddar and Gruyère
2tablespoonsall-purpose flour
1teaspoondried thyme or oreganooptional
Pinchof salt and black pepper
Instructions
Preheat oven to 400°F (200°C) and line two large baking sheets with parchment paper.
In a medium bowl, toss sliced onions, shredded cheese, flour, thyme (if using), salt, and pepper until evenly coated.
Arrange small, even piles (about 2–3 inches wide) of the mixture on the baking sheets, leaving space between each pile for spreading.
Bake for 15–18 minutes, or until cheese is deep golden brown and edges are crispy. Watch closely to prevent burning.
Cool on the baking sheet for 5–10 minutes to allow crisps to harden, then transfer to a wire rack to finish cooling.
Notes
Crispness matters: Remove crisps only when they are uniformly golden brown and firm. Pale spots may mean they need a few more minutes.Thin slicing is essential: Paper-thin onion slices cook evenly and crisp at the same rate as the cheese. A mandoline slicer works best for consistent cuts.Cheese quality: Use sharp, high-quality cheese and avoid pre-shredded varieties with anti-caking agents to ensure the best texture.Storage: Best eaten fresh, but can be stored in an airtight container at room temperature for up to 2 days. Re-crisp in a 350°F (175°C) oven for a few minutes if needed.Flavor twist: Add chili flakes, smoked paprika, or a pinch of garlic powder for an extra kick.