Quick Recipe: Confetti (Funfetti) Thumbprint Cookies 🎉 A festive, fun cookie that's soft, buttery, and full of sprinkles, with a sweet thumbprint center perfect for frosting or jam. Ingredients 1 cup (225g) unsalted butter, softened ½ cup (100g) granulated sugar ½ cup (110g) packed light brown sugar 1 large egg, separated (white reserved) 2 tsp vanilla extract 2 ¼ cups (280g) all-purpose flour ½ tsp baking powder ¼ tsp salt ½ cup (approx. 100g) rainbow sprinkles (jimmies, not nonpareils) For Fi