Frosted Sugar Cookie Bars

Instructions

1. Preheat oven to 375 degrees. Butter a quarter sheet pan OR a 13" x 9" baking dish, set aside.
2. In a mixing bowl combine flour, baking powder and salt, set aside.
3. In the bowl of an electric mixer, whip together butter and sugar until pale and fluffy about 2-3minutes. Mix in egg and egg white. Add sour cream and vanilla and mix until blended. (mixture may be a little lumpy at this point.)
4. With the mixer running on low, slowly add dry mixture and stir until just combined. Scoop dough into prepared pan, and use an off-set spatula to gently spread it to the edges. (Use your hands to gently press if needed.)
5. Bake 15-18 minutes or until the middle is slightly firm and the edges are lightly golden.
6. Cool completely, then frost and cut into squares.

Vanilla Frosting:

1. In a mixing bowl, with an electric mixer, whip together butter and powdered sugar until thick. (Mixture will seem dry.) Add half and half a little at a time until fluffy. Mix in vanilla and salt. Add in food optional food coloring and mix until well blended.