1/2 c. butter
1/2 c. flour
3 c. milk
3 bananas, sliced
1/2 c. sugar
1 tsp. vanilla
1 box vanilla wafers

Melt butter, then add flour. Stir in 1 cup of milk at a time. Stir until it bubbles. Add sugar, then stir well. Remove from heat, then add vanilla. Pour over vanilla wafers and bananas; chill.