Peanut Butter Bars

1 cup brown sugar
1/2 cup margarine, melted
1/2 cup chunky peanut butter
1 egg
1 tsp. vanilla
1 1/2 cups flour
1 tsp. baking soda
1/2 cup oatmeal

Mix all ingredients together. Batter will be very thick. Press into greased 9"x13" pan. Bake at 375 degrees for 12 to 15 minutes. Let cool and frost.

Frosting:
2 tbsp. margarine
2 tbsp. peanut butter
1 1/2 cups confectioners' sugar
1 tsp. vanilla
2 to 3 tbsp. milk

Mix all ingredients together until smooth; drizzle over bars.