Preheat your oven to 350°F (175°C) and grease an 9x13 inch baking pan.
In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
1/2 cup unsalted butter, 3/4 cup granulated sugar, 1/4 cup packed brown sugar
Beat in the egg and vanilla extract until well combined.
1 large egg, 1 teaspoon vanilla extract
In a separate bowl, whisk together the flour, baking powder, and salt.
1 3/4 cups all-purpose flour, 1 teaspoon baking powder, 1/4 teaspoon salt
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.
1 3/4 cups all-purpose flour, 1 teaspoon baking powder, 1/4 teaspoon salt, 1/2 cup unsalted butter, 3/4 cup granulated sugar, 1/4 cup packed brown sugar, 1 large egg, 1 teaspoon vanilla extract
Press the dough evenly into the prepared baking pan.
Bake for 20-25 minutes, or until the edges are lightly golden.
Let the bars cool completely in the pan before frosting.
While the bars are cooling, prepare the frosting. In a medium bowl, beat together the powdered sugar, softened butter, milk or cream, and vanilla extract until smooth.
2 cups powdered sugar, 1/4 cup unsalted butter, 2-4 tablespoons milk or cream, 1/2 teaspoon vanilla extract
Spread the frosting evenly over the cooled bars.
2 cups powdered sugar, 1/4 cup unsalted butter, 2-4 tablespoons milk or cream, 1/2 teaspoon vanilla extract
Sprinkle with sprinkles, if desired.
Sprinkles
Cut into squares and serve. Enjoy your Best Sugar Cookie Bars!
