Step 1

Preheat oven to 350 degrees. Grease a 9x13 pan and set aside.

Step 2

In a large mixing bowl, use a hand mixer to beat butter and confectioners' sugar until blended. Slowly beat in 1 and 1/2 cups flour.

Step 3

Press into the bottom of a greased 13x9 pan and bake for 18-20 minutes until golden brown.

Step 4

While baking, in a small bowl whisk eggs, sugar, zest, lemon juice, milk and remaining 3 T flour until frothy. Pour over the hot crust.

Step 5

Turn oven to 325 degrees and bake an additional 18-20 minutes until the top is lightly brown. Cool completely on a wire rack. Dust the top with additional confectioners' sugar. Cut into bars and refrigerate leftovers.