Peanut Butter Squares

These are just like those peanut butter bars with chocolate frosting that you used to find in your elementary school cafeteria! Yum!
3/4 C. butter, softened
1/2 C. sugar
1/2 C. brown sugar
1 egg (large)
2 tsp. vanilla
3/4 C. creamy peanut butter
1 tsp. baking soda
1/2 tsp. salt
1 C. flour
1.5 C. oats
Frosting: 1 C. milk chocolate chips.
Preheat oven to 350 degrees and grease a 8x8 glass pan13x9x2 inch pan. Beat butter and sugars until creamy. Add egg, vanilla, and peanut butter and beat until light and fluffy. Add dry ingredients and mix until combined. Press mixture evenly into pan and bake 15-18 minutes or until lightly browned. (Note: Will be underbaked.) While still warm, evenly distribute chocolate chips. When chips have melted spread into a thin layer.