Name: Frosted Sugar Cookie Bars
Prep time: 25 min
Cook time: 25 min
Total time: 1 h 30 min
Yield: 16 bars
Ingredients: 1/2 cup (115g) unsalted butter, softened to room temperature; 3/4 cup (150g) granulated sugar; 1 large egg + 1 egg yolk*; 2 teaspoons pure vanilla extract; 1 and 1/2 cups (190g) all-purpose flour (spoon & leveled); 1/4 teaspoon salt; 1 teaspoon baking powder; 1/2 teaspoon baking soda; 1 and 1/2 teaspoons cornstarch; 1/2 cup (80g) rainbow sprinkles (not nonpareils)*; 3/4 cup (170g) unsalted butter, softened to room temperature; 2 and 1/4 cups (270g) confectioners' sugar; 1 teaspoon pure vanilla extract; salt, to taste; optional: food coloring (I used 1 drop red for this pink frosting) and extra sprinkles for decorating on top