Gluten-Free Brownie Brittle

"This batch of brownie brittle is topped with chopped salted almonds and dark chocolate. [Photographs: Elizabeth Barbone] Part cookie, part brownie, this brownie brittle is as easy to make as it is to eat. A batch comes together in under 30 minutes. While the brittle tastes great on its own, adding chocolate chips, chopped nuts, and other toppings takes it over the top. Add about 1/2 cup of of your favorite toppings. Any more, and the toppings will overwhelm the brittle. Why this recipe works: * Thinly spread on a baking sheet, the batter becomes crispy with just small note of chewiness, like the edge of a traditional brownie. * Cocoa powder, not melted chocolate, ensures a deep chocolate flavor without adding too much richness to the recipe...."