This is a wonderfully engineered product, a great concept well-executed, down to the detail of furnishing a plastic spatula made to fit without damaging the inner surface of the pan. I made brownies in it last night for the first time. After checking some great-sounding brownie recipes, I decided to make the recipe that came with the pan. My partner and I couldn't wait till the brownies cooled, so we sampled them while still warm. My memory will long savor that first bite as the best brownie I've ever had. Crunchy on the outside, soft, warm and chewie on the inside. The next brownie, this morning, was not disappointing either.
How to convert other recipes? The little booklet says you can use any recipe intended for a 9-inch square or 9 x 13 pan. That's a fairly wide range, and what about all the brownie recipes written for an 8-inch square pan? So I tried to calculate the surface area of the pan bottom. The problem is complicated by the irregular shape of this pan, plus the fact that the walls slant slightly and curve at the bottom. I filled a 9" round pan with two quarts of water and measured the depth it filled, slightly more than 1.75 inches (1 25/32"). Two quarts filled the Edge pan to a depth of almost 1.5 inches (1 7/16"). Based on the surface area of a round 9" pan being 63.64 square inches, I came up with a surface area of about 79 square inches for the Edge pan.
A 9-inch square pan is 81 square inches and a 13-inch pan is 117 square inches. An 8-inch square pan is 64 square inches. You should increase an 8-inch square recipe by 20 to 25 percent. If you use a recipe intended for a 9x13 pan, you'll have extra-thick brownies.