Preheat oven to 350. Prepare cookie sheets by lining with parchment paper.
In an electric mixer beat the softened butter and sugars until fluffy. Add eggs and vanilla. Mix thoroughly.
In a separate bowl mix the Flour,Baking Powder Cinnamon, and Salt. Add to Sugar/Butter Mixture and combine but do not over mix.Add Oats and Raisins. Drop by tablespoons onto prepared cookie sheet.Bake for 13-14 minute Be careful not to over bake.Leave on the cookie sheet until cool completely. Cookies will continue to bake and become crispy.
In a medium bowl mix the confectioners sugar, the cinnamon and the milk. You may need less or more of the milk to make a glaze.Place glaze in a small sandwich bag and cut off the corner and squeeze onto the cooled cookies.