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Extra-Chewy Peanut Butter Sandwich Cookies Filled with a luscious peanut butter cream filling and unbelievably easy to whip up, these extra-chewy peanut butter sandwich cookies are totally a peanut butter-lover's dream! 8 servings 3/4 cup butter 3/4 cup sugar 3/4 cup powdered sugar 1 teaspoon baking soda 1/4 teaspoon salt 2 eggs 1/4 cup plain yogurt 2-1/2 teaspoons vanilla extract 1 cup creamy peanut butter 1 tablespoon milk 1-1/2 cups flour