Preparation Steps

• Preheat oven to 350°F (175°C). Grease and flour a 9x13 inch baking sheet.
• In a large bowl, cream together the butter and sugar until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla.
• In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add to the wet ingredients, mixing until just combined.
• Spread the dough evenly into the prepared baking sheet.
• Bake for 18-20 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs attached.
• Let cool completely before frosting.
• For the frosting, beat together the softened butter, powdered sugar, milk, and vanilla extract until smooth and creamy. Spread over the cooled bars and decorate with sprinkles, if desired.
• Cut into squares and serve.