Giant cookie for Mom's birthday!

I've officially become the dessert queen in my family. So as it rolled closer to my Mom's birthday I asked her what she would like. Her response was oatmeal raisin cookies with chocolate chips. So I came up with the idea to make one big giant cookie just like Mrs. Fields. So it would be like a birthday cookie cake! It was a total hit!

I used Quaker Oats Vanishing Oatmeal Cookies recipe http://www.quakeroats.com/cooking-and-recipes/content/recipes/recipe-detail.aspx?recipeid=474 .Just like the title says they do vanish quickly. Then I just made a basic frosting to write "Happy Birthday" on it. 

Vanilla Frosting

• 4 cups of confectionery sugar
• 1/2 butter
• tbsp. vanilla