Oatmeal Cake with Broiled Coconut Frosting

This is my Grandma's recipe. It's really moist and buttery and so yummy!

Oatmeal Cake with Broiled Coconut Frosting
Joann Reed
Cake
1 ½ cups boiling water
1 cup rolled oats
1 cup butter
2 eggs
1 cup brown sugar
1 cup white sugar
1 ⅓ cups flour
1 tsp vanilla
1 tsp salt
1 tsp soda
1 tsp nutmeg
1 tsp cinnamon
Frosting
½ cup evaporated milk
1 cup white sugar
6 TBSPs butter
1 tsp vanilla
1 cup sweetened coconut flakes

1. To make cake: In a large mixing bowl, pour boiling water over oats and butter. Stir and let stand until melted. Add eggs, sugars, flour, vanilla, salt, soda, and spices; mix well.
2. Pour into 9x13 inch pan, and bake at 350 degrees for 30-40 minutes.
3. To make frosting: In small saucepan, heat evaporated milk and sugar until dissolved. Add butter and stir until melted. Remove from heat. Add vanilla and coconut; mix well (will  be very runny).
4. Pour onto warm cake, and spread evenly. Broil for 3-5 minutes or until coconut is lightly browned.