1 c. mashed potatoes
1/2 c. butter
1 c. sugar
1 3/4 c. flour
1 tsp. baking soda
1/2 tsp. salt
2 tbsp. lemon juice or vinegar
2/3 c. milk

Blend first 4 ingredients and then add the rest. Blend until mixed well. Bake at 350 degrees for 30 to 35 minutes.