Preheat oven to 350 ˚F and line a cookie sheet with parchment paper.
Combine flour, baking soda, baking powder, salt, cinnamon in a small bowl. Set aside.
In a mixing bowl with an electric mixer cream butter, white sugar, brown sugar, egg and vanilla.
Combine wet and dry ingredients and mix until just combined.
Add in oatmeal and raisin until evenly distributed.
Scoop large balls of dough and place on the cookie sheet. I was able to make 18 cookies.
Bake for 10-15 minutes, or until lightly browned.
While cookies are baking, make the glaze. Combine all glaze ingredients, adjusting milk and powdered sugar to get your desired glaze consistency.
When cookies are done, let them rest on the cookies sheet for a few minutes before transferring to a cooling rack. Brush on glaze.
10. Enjoy!