My Mother made this cake for Christmas every year and my Oldest brother would hide part of it to take home with him. Since she passed away my Sister and I have kept the tradition going but we now make 2 cakes so my brother now has his very own cake to take home.
Preheat oven to 350 degrees, Grease and flour 13x9 pan.
In saucepan, bring to a boil 1 1/2 cups water. Remove from heat and stir in 1 cup quick cook oats. Let set for 20 minutes.
In mixing bowl combine 1 stick softened butter and 2 well beaten eggs. Mix until creamed.
Add 1 cup sugar and 1 cup (firmly packed) brown sugar, and 1/2 tsp vanilla. Mix until well blended.
Add the oatmeal and mix well.
In a seperate bowl, combine cinnamon,(I usually add a little more cinnamon than the recipe calls for, just because I like the taste)baking soda and flour.
Gradually add the flour to the oatmeal mixture, mixing well as you go.
When mixed throughly pour into prepared pan. Bake at 350 degrees for 30 to 35 minutes.
To make the topping: In 2 quart saucepan,combine 1 cup sugar, 1 can evaporated milk, 1 stick of butter, 1 tsp. vanilla, 1 tbsp. flour and 3 well beaten egg yolks. Cook over medium to medium high heat stirring constantly untill thickened. (I usually add the flour to the sugar and mix it in to keep from lumping)
Prick holes in the still warm cake with a fork and pour the topping over the entire cake. Let set about 30 minutes. Now it's time to enjoy!!