1. Preheat oven to 350 degrees. 2. In a stand mixer, mix the flour, baking powder, baking soda, salt, brown sugar, sugar, and cinnamon together.3. Add in the softened butter and mix until well combined. Next, add in eggs one at a time until completely combined. 4. Pour in the melted cookie butter, milk, sour cream and vanilla until completely combined. Pour the batter into a 9x13 inch cake pan.5. Bake for 23-25 minutes or until a toothpick inserted into the middle comes out clean.6. While the cake is cooling, make the frosting by mixing the butter, powdered sugar, vanilla, cookie butter and heavy cream together with the whisk attached. Whisk on medium for 5 minutes.7. Once the cake is cooled, frost with the cookie butter icing. Decorate with melted cookie butter and crushed cookies if desired.