In a bowl, combine the old-fashioned oats with boiling water and let soak for 15 minutes.

Preheat your oven to 350°F (175°C).

In another bowl, whisk together the flour, baking soda, baking powder, cinnamon, and salt.

In a large mixing bowl, cream the butter, granulated sugar, and brown sugar until light and fluffy.

Add the eggs and vanilla extract to the butter mixture, mixing until fully incorporated.

Slowly mix the dry ingredients into the wet mixture.

Fold the soaked oats into the batter until evenly combined.

Pour the batter into a greased 9x13 inch baking pan and smooth the top.

Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.

Let the cake cool completely before frosting.