Ingredients

• 1 1/2 cups butter or 1 1/2 cups margarine, softened
• 4 large eggs
• 3 cups brown sugar, firmly packed
• 2 teaspoons vanilla extract
• 5 cups rolled oats
• 3 cups whole wheat flour
• 1/2 cup all-purpose flour
• 4 teaspoons baking soda
• 2 teaspoons salt
• 1 1/2 cups semi-sweet chocolate chips