my sister's famous peanut butter bars

1 cup sugar
1cup brown sugar
1 cup margarine
2 eggs
1 tsp vanilla
1 cup peanut butter
2 tsp baking soda
1 tsp salt
2 cups flour
2 cups oats
Cream sugars, margarine, eggs, vanilla, and peanut butter. Add flour, salt, and soda. Mix in oats and pat into a 12x18 pan. Baken at 325 for 20 minutes. Remove from oven even though bars may still seem soft. Let cool, but while still warm spread a thin layer of peanut butter over the bars and then top with chocolate chips and let them melt on top. Eat them up, yum!