In a mixing bowl, cream butter and 1 cup sugar. Add egg, beat well. Combine buttermilk and vanilla, set aside. Combine flour, baking soda and salt. Add alternately with buttermilk and vanilla to the creamed mixture. Stir in rhubarb. Spread in a greased 13x9-inch pan. Combine the remaining sugar with cinnamon; sprinkle over batter. Bake 350 degrees F for 35 minutes or until cake is done. For topping, combine all ingredients; then pour over individual square.
By Mary in FL from Cocoa, FL
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