Blueberry Bars

Directions

1. 1
   Place flour and sugar in large mixing bowl.
2. 2
   Cut in margarine until size of small peas.
3. 3
   Measure 3/4 cup of mixture and reserve for crumb topping.
4. 4
   Add unbeaten egg yolks and 1 cup milk to remaining crumb mixture in bowl.
5. 5
   Beat for 3 minutes until well blended (electric mixer at low).
6. 6
   Beat 2 egg whites until stiff, but not dry.
7. 7
   Fold gently, but thoroughly, into batter.