Preheat and Prep. Preheat the oven to 350° F. And prep the following: • Mix ½ cup sugar and 1 tablespoon cinnamon in a small bowl. Set aside. • Warm ¼ cup butter in a small dish until melted. Set aside.
Make the Dough. In a large bowl, whisk together the flour, sugar, cinnamon, and salt. Grate or cube the cold butter, then work it into the dry ingredients until pea-sized. Add the sourdough starter and vanilla and mix until a dough forms, using your hands if needed. If the dough is dry, add cold water one tablespoon at a time until it comes together.
Roll the Dough. Line a baking sheet with parchment paper and sprinkle it lightly with flour and cinnamon sugar. Place half of the dough on the parchment and roll it into a large rectangle about ⅛ inch thick.
Cut the Dough. Cut into ½ inch squares with a pizza cutter, then transfer the parchment to a baking sheet.
Add Butter and Cinnamon-Sugar. Generously brush the top of the dough with melted butter. And even more generously, sprinkle with the cinnamon mixture.
Bake and Enjoy! Bake for 15-20 minutes or until golden brown. The cereal will get crunchier as it cools, so let it come to room temperature before serving.Serve with cold milk and fresh fruit, enjoy a handful as a snack, or crumble over egg-free vanilla ice cream with a drizzle of molasses syrup.
