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Preheat oven to 325 degrees.
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Combine flour and baking soda in a small bowl.
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In a separate bowl, melt 1/2 cup butter in microwave.
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Add 1/3 cup sugar and 1/3 cup brown sugar to the melted butter and cream all together.
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Add the other 1/2 cup butter to your prepared butter/sugar combo and mix.
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Add rest of sugar, brown sugar, and the peanut butter. Cream well.
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Add egg whites and vanilla to the butter and sugar mixture and combine once more.
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Gradually add flour mixture to your wet mix about 1/3 cup at a time until all the flour is combined.
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Roll dough into round balls of any size and place on baking sheet. Bake for 8-10 minutes.
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Let cool on baking sheet for 1-2 minutes and then remove to a cooled surface. ENJOY!