Place the flour, brown sugar, baking powder, baking soda, and salt in a large bowl and whisk to combine. Add the softened butter, mixing on medium speed, until the mixture resembles damp sand. Add the eggs, one at a time, scraping the bottom and sides of the bowl with a silicone spatula after each addition. Scrape the bottom and sides of the bowl with a silicone spatula, and stir in the International Delight Pumpkin Pie Spice Coffee Creamer
and sour cream. Mix on medium-high speed for about 90 seconds, to aerate the batter and develop the cake’s structure.