Butterscotch bars

Ingredients

• 2 1/4 cups all-purpose flour
• 2 1/2 teaspoons sifted baking powder
• 1/2 teaspoon salt
• 3/4 cup butter
• 1/2 cup granulated white sugar
• 2 cups dark brown sugar
• 3 whole eggs
• 1 teaspoon pure vanilla extract