Preheat oven to 350 degrees and grease a 9 x 13 pan.
Put water on to boil in microwave or stovetop. In a small separate bowl, pour boiling water over oats and let cool in the fridge
Cream together sugars and butter in a stand-up mixing bowl like Bosch or KitchenAid. Beat in the eggs and vanilla. Add cooled oatmeal.
In a separate bowl, whisk together flour, soda, salt, and cinnamon. Slowly mix into the wet ingredients. Pour and evenly spread the batter into greased pan.
Bake for 20 to 25 minutes until a toothpick inserted into the middle comes out clean. Let cool while preparing the topping.
Coconut Caramel Topping
Combine butter, brown sugar, and evaporated milk in a large saucepan. Cook over low heat until thickened.
Remove from heat and add coconut and chopped pecans.
Spread topping on the cake and broil for 1-2 minutes. Cool for at least 20 minutes before cutting and serving.