2 c. unsifted all-purpose flour
1 c. sugar
1 tsp. baking soda
1/4 c. cocoa
1/8 tsp. salt
1 c. mayonnaise
1 c. water

Stir together flour, sugar, cocoa and salt in large mixing bowl. Add mayonnaise and water. Beat at low speed until all ingredients are moistened. Beat at high speed 2 minutes.

Pour batter into 12"x8"x2" dish which has been greased on bottom only. Place dish in microwave oven on high power level and cook 9 to 11 minutes, giving dish 1/4 turn after 5 minutes.