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Cream the salted butter and the sugars together until smooth.
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Add the eggs, vanilla, and 1 cup peanut butter.
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Add oatmeal and mix thoroughly.
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Mix the flour, baking soda, and salt separately, and add gradually.
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Press into a jelly roll pan {cookie sheet}
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Bake at 350 degrees for 15 minutes.
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While the bars are baking, combine 1/4 c milk and 1 cup of peanut butter and blend until smooth. Add more milk if you need to until it's creamy.
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After the bars come out of the oven, carefully spread the whipped peanut butter over the top.
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To do so easily, drop small amounts of the peanut butter across the pan and it will be easier to spread.
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Sprinkle chocolate chips across the top of the peanut butter, and put the pan back into the hot oven for 1-2 minutes to melt the chocolate chips.
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Swirl the peanut butter frosting and chocolate together to create a marbled frosting.
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Cool and enjoy.