1/2 c. cornstarch
1/2 c. flour
1 1/2 tsp. baking powder
3/4 tsp. salt
1/3 c. milk
1/3 c. water

Combine cornstarch, flour, baking powder and salt in bowl. Blend in milk and water. Enough batter for 2 dozen mushrooms. Heat oil to 350 degrees. Dip cleaned mushrooms into batter to coat, then into hot oil until golden brown. Serve while still warm.