For cake: Pour boiling water over oats stir to combine, cover and let stand 20 minutes. Beat butter until creamy gradually add sugars beating until fluffy. Blend in vanilla and eggs, add to oats mixture and blend well. In separate bowl sift together flour, soda, salt & spices and add to creamed mixture, mix well. Pour batter into a well greased and floured 9"x13" baking pan. Bake at 350 degrees for 50 to 55 minutes.
For Topping: Combine all ingredients spread evenly over cake and broil until frosting becomes bubbly.