For Crust: Preheat oven to 350 degrees F. Combine 2 cups flour and 1/2 cup sugar in medium bowl. Cut in 1 cup butter with pastry blender or two knives until mixture is crumbly. Press lightly onto bottom and halfway up sides of ungreased 13 x 9 inch baking pan. Bake for 20 minutes.

 

For Filling: Beat sweetened condensed milk and eggs in large mixer bowl until fluffy. Beat in lemon juice, 1 Tbsp flour, baking powder, salt and food coloring just until blended. Fold in lemon peel; pour over crust. Bake for 20 to 25 minutes or until filling is set and crust is golden brown. Cool in pan on wire rack; refrigerate for 2 hours. Cut into bars; sprinkle with powdered sugar.