Preheat oven to 400 degrees. Grease a 13 x 9 x 2 inch baking dish.
In a large bowl, combine the oatmeal, brown sugar, corn syrup, margarine, peanut butter and vanilla. Stir until moist. Spread in pan (batter will be thick). Bake for 12 minutes; cool slightly.
Combine chocolate and butterscotch chips, peanut butter and vanilla in small saucepan. Stir until melted. Spread on warm bars.
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