Preheat your oven to 350 degrees F. Spray three 8-inch or four 6-inch round cake pans with nonstick cooking spray, line the bottoms with parchment paper and spray again. Set aside.
In a medium sized pot bring the water to a boil. Add in the oats, stir and remove the pot from the heat. Cover the pot and allow the oats to soak for 20 minutes, until all the water is absorbed. Let the oatmeal cool completely before adding it to the cake batter.
In a medium sized mixing bowl, combine the baking soda, salt, cinnamon, flour and Kodiak mix (if using). Whisk together. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and sugars together on medium speed for 2 minutes until light and fluffy. Add in the vanilla and the eggs and mix until combined, scraping the sides of the bowl as necessary.
Turn the mixer to low and add in the cooled cooked oats and the flour, mixing until just combined. (If you're not using the Kodiak mix, this is when you can add in the extra cinnamon and uncooked oats).
Toss the mini chocolate chips in a tablespoon of flour and then stir into the batter.
Spread the cake batter into the prepared pans, about 20 ounces of batter in each 8-inch or 15 ounces in each 6-inch pan, and bake for 20-22 minutes or until the cake is set in the center and a toothpick comes out with just a few moist crumbs on it.
Allow the cake to cool in the pans for about 5 minutes and then invert onto wire racks to cool completely. Level the cakes.
If you're not using the cake layers right away, wrap each layer in plastic wrap. You can freeze them up to a week or up to a month if you also wrap them in foil.