Bake Festive Cookie Bars with Christmas Sprinkles

Ingredients

• 1 cup unsalted butter, softened (227 g)
• 1 cup granulated sugar (200 g)
• 1 cup brown sugar, packed (220 g)
• 2 large eggs
• 2 teaspoons vanilla extract
• 3 cups all-purpose flour (360 g)
• 1 teaspoon baking powder
• ½ teaspoon baking soda
• ¼ teaspoon salt
• ½ cup unsalted butter, softened (113 g)
• 2 cups powdered sugar (240 g)
• 2 tablespoons milk or heavy cream
• 1 teaspoon vanilla extract
• Christmas-themed sprinkles, approximately ¼ cup (50 g)