Mix flour and baking soda together. Using electric mixer on medium to high speed, beat margarine for 30 seconds or until softened. Add peanut butter, sugar and brown sugar. Beat until combined, scraping sides of bowl occasionally. Add egg whites and vanilla, beating until well combined. Add flour mixture and beat on low until mixed well. Stir in oats. Drop rounded teaspoonfuls 2-inches apart on an ungreased cookie sheet. Bake at 375 degrees for 8 to 10 minutes or until edges are golden. Makes about 36.

Per Serving (1 cookie): 69 Calories, 2 g. Protein, 9 g. Carbohydrate, 3 g. Fat, 0 mg. Cholesterol, 51 mg. Sodium and 47 mg. Potassium.