Foryoueats: Best S'mores Bars

Ingredients

• 1/2 cup unsalted butter, softened
• 1/2 cup white sugar
• 1/4 cup packed brown sugar
• 1 egg
• 1 teaspoon vanilla
• 1 teaspoon baking powder
• 1 1/4 cup all purpose flour
• 1 teaspoon coarse kosher salt
• 6 graham crackers, crushed into crumbs (1 graham cracker = 1 rectangle)
• 1/2 cup peanut butter
• two 4–ounce chocolate bars (the extra big, extra-thick size)
• one 7-ounce jar of marshmallow creme