Sugar Cookie Bars

I originally saw these on Love and Olive Oil. They're really tasty, and the bar form makes them very easy to make.

Sugar Cookie Bars

 For the cookies:

1 c unsalted butter, room temperature

2 c sugar

4 large eggs

2 tsp vanilla extract

5 c all-purpose flour

1 tsp salt

1/2 tsp baking soda

For the frosting:

1 c butter, room temperature

1 tsp vanilla extract

pinch of salt

1 c confectioners sugar

5 T milk

food coloring

Preheat oven to 375.

Cream butter and sugar until fluffy. Add eggs, one at a time. Mix in vanilla. In a separate bowl, sift together flour, salt and baking soda. Gradually add butter mixture and mix until just combined. Grease a large rimmed baking sheet (13x18) or line with parchment paper. Evenly spread batter into pan. Bake 15-20 minutes until light golden brown and a toothpick comes out clean.

To make frosting, beat butter until fluffy. Mix in vanilla and salt. Add confectioners sugar, one cup at a time, until combined and then add milk and mix until smooth. Add food coloring if desired. Spread over cooled cookies, then cut into bars.