01 -
Preheat the oven to 300°F. Line two rimmed baking sheets with parchment paper.
02 -
Wash the kale, remove the tough center stems, and tear the leaves into large bite-size pieces. Dry very well in a salad spinner or with clean towels.
03 -
Place the dry kale in a large bowl. Add olive oil, garlic powder, Parmesan, salt, pepper, and lemon zest if using. Massage gently until the leaves are lightly coated.
04 -
Divide the kale between the baking sheets in a single layer. Do not crowd the leaves, or they will steam instead of crisp.
05 -
Bake for 18-22 minutes, rotating the pans halfway through, until the edges are crisp and the Parmesan is lightly toasted. Remove smaller finished pieces early if needed.
06 -
Let the chips cool on the baking sheets for 5 minutes. Taste and add a tiny pinch of salt if needed, then serve right away.