MAKES ABOUT 4 CUPS
1⁄2 cup granulated sugar
1⁄4 cup packed light brown sugar
2 tablespoons all-purpose flour
11⁄4 teaspoons kosher salt
41⁄2 tablespoons unsalted butter, melted
1⁄4 cup heavy cream
2 large egg yolks
1⁄2 teaspoon vanilla extract
1 cup flavorful pantry item (cereal, crackers, chips, pretzels, snack mix, granola, etc.—nuts and seeds work well here too!)
Heat the oven to 350°F. Line a flat baking pan with parchment paper or with a Silpat.
Whisk together the sugars, flour, and salt in a medium bowl. Add the butter, heavy cream, egg yolks, and vanilla and whisk until smooth.
Pour the mixture into the baking pan and spread it out with a spatula until 1⁄2 inch thick. Crush up and sprinkle your selected pantry item over the mixture. Bake for 12 to 15 minutes, until dark brown (at golden brown, it will still be a little chewy, which is OK, but I like to get real color on my crackle). Let cool completely.
Remove the crackle from the pan and break it up into medium to small pieces. Store the brittle in an airtight container and try to gobble it up within a month (or, try not to gobble it all up immediately).