Amish Oatmeal Cake

As someone who doesn't like cake, this is one of the rare exceptions. It's SO moist and delicious. I love the coconut in the topping. This is a combination of two recipes. I don't remember where I got the cake recipe, but I switched out the topping recipe I used to use once I tried this one from my friend, Jeanee. So good! 

1 c. rolled oats
1 ¼ c. boiling water
½ c. butter or margarine
1 c. sugar
1 c. packed brown sugar
2 eggs
1 tsp. baking soda
½ tsp. salt
1 tsp. cinnamon
1 2/3 c. flour
1 tsp. vanilla
        Mix oats and boiling water together; set aside for 20 minutes. Cream butter or margarine and sugars together thoroughly. Add eggs, one at a time, beating well after each. Blend in oatmeal mixture. Sift together remaining dry ingredients. Fold into batter. Stir in vanilla. Pour into a greased and floured 9x13 baking pan. Bake at 350° for 30-35 minutes. (22 minutes is long enough in my oven.)
   

While cake is baking, make the following topping:
2 eggs
½ c. evaporated milk
2 c. brown sugar
2 c. sweetened flaked coconut
1 c. butter
        Boil for 2 minutes. Stir in 2 tsp. vanilla and ½ - 1 c. chopped walnuts or pecans.
        Allow cake to cool until just warm before pouring topping over the cake.