Pop quiz: How many boxes of cereal are in your pantry? Assuming that you're sitting on a surplus like most families, we have just the recipe for you: cereal brittle. Line a baking sheet with parchment paper and brush with vegetable oil. In a saucepan, combine 2 tablespoons water and 1 cup sugar. Bring to a boil over medium-high heat; cook, swirling the pan but not stirring, until amber, 6 to 7 minutes. Remove from the heat and stir in 1 cup cereal (we used a mix of Cinnamon Toast Crunch, Kix and Cheerios); pour onto the prepared baking sheet and spread with a rubber spatula. Let cool completely, then break into pieces.