Preheat oven to 375 degrees. In a medium sized bowl, melt butter or margarine in the microwave until soft and melting, add white and brown sugars and blend well. Beat in the eggs, then stir in the vanilla. In a large bowl, sift flour, baking soda, salt & cinnamon and stir, blending well. Add the butter & sugar mixture and stir it in well, blending all. Add oats and mix together well.