Soft and chewy Sugar Cookie Bars topped with vanilla buttercream frosting. The easiest, tastiest sugar cookies ever!
Preheat oven to 375°F. Line a 9x13 baking pan with foil and grease it.
Beat butter and sugar for several minutes, until light and fluffy. Add egg, sour cream and extracts and beat until thoroughly combined. The mixture might look slightly curdled.
Dump the dough into the prepared pan and use your fingers to evenly press it into the pan. Bake for about 15 minutes, until the top appears dry and the edges are just starting to turn light brown. I rotate the pan halfway through the baking time. Make sure not to over bake these, as they will continue to cook a little after you remove them from the oven. Cool the bars completely before frosting them.
Beat butter and powdered sugar for several minutes until light and fluffy. Add milk, extracts and food coloring (if using) and beat for several more minutes. Use an offset spatula or butter knife to spread the frosting over the cooled bars. Top with sprinkles and slice into squares.