Preheat the oven to 350°.
Pour the boiling water over the oatmeal. Stir and let it set for at least 15 minutes, while you mix the rest of the ingredients
1 1/2 c. boiling water, 1 c. quick oats
In a large mixing bowl, cream the butter and sugars. Beat well.
1/2 c. softened butter or shortening, 3/4 c. white sugar, 3/4 c. brown sugar
Add the eggs and vanilla and mix until creamy.
2 large eggs, 1 tsp. vanilla extract
Add the oatmeal mixture and mix.
In a separate bowl, mix the flour, cinnamon, soda, salt, and nutmeg. Add to the creamed mixture and stir to combine.
1 1/2 c. all-purpose flour, 1 1/2 tsp. cinnamon, 1 tsp. baking soda, 1/2 tsp. salt, 1/2 tsp. ground nutmeg
Pour it into a greased 9x13" metal pan (or any 9x13" broiler-proof pan) and bake for 30 -35 minutes at 350°. A toothpick inserted in the center should only have a few crumbs.
While the cake is still hot from the oven, evenly spread the topping mixture over the top. Turn the broiler to low heat and place the cake pan about six inches below the broiler. Broil for about 2 - 3 minutes or until lightly browned. Make sure to keep your eye on it because it can burn quickly.
Cool and enjoy! Store in an airtight container for up to 4 days. You can also freeze some for later.