Step 1

Preheat the oven to 350°F (177°C). Spray a 9x13 baking pan well with nonstick cooking spray and set aside.

Step 2

In a large mixing bowl, whisk together the flour, baking powder, baking soda, salt, and spices until well combined. Set aside.

Step 3

In a separate large mixing bowl, whisk together the brown sugar, oil, applesauce, eggs, vanilla extract, and buttermilk until fully combined.

Step 4

Add the dry ingredients to the wet ingredients and mix together until just combined.

Step 5

Pour the batter into the prepared baking pan. Bake for 30 to 45 minutes or until the top of the cake is set and a toothpick inserted into the center comes out clean.

Step 6

Remove from the oven and transfer to a wire rack to cool completely.

Step 7

In the bowl of a stand mixer fitted with the paddle or whisk attachment, or in a large mixing bowl using a handheld mixer, beat the cream cheese until smooth. Add the butter and mix for about 30 seconds to 1 minute until well combined and smooth.

Step 8

Add the powdered sugar and vanilla extract and continue mixing until fully combined, stopping to scrape down the sides of the bowl as needed.

Step 9

Spread the frosting on top of the cooled cake.