Firstly, you cut the top off your onion and peel the skin off. Poppy recommends chopping it horizontally first, in order to maintain a straighter cut. Chet shows how to cut onions properly.
Lightly grease a 13” x 9” baking dish with cooking spray. Arrange an onion on its side on a cutting board. Using vertical slices, cut onion into 1/4"-thick rounds. Separate rounds into ...