1In a mixer bowl, cream together the butter and sugars until it is nice and creamy.
Add eggs one at a time and blend until each is well incorporated.
Add the vanilla and mix well.
In a medium bowl combine flour, oatmeal, baking soda and salt.
Slowly add the dry ingredients into the batter until well combined
Spray baking pan with a non stick cooking spray and spread the batter into pan.
2Bake at 325 Degrees for 20-25 minutes or just until the bars are slightly browned and a tooth pick inserted into the corner comes out clean.
Allow them to cool while making the icing.
3In a saucepan, add all of the icing ingredients and melt over low heat, stirring occasionally.
Spread over the bars and allow to cool before cutting and serving.