Pumpkin Fireball Cakes

For the cake

• Cooking spray

• 2 cups

  all-purpose flour 

• 2 tsp.

  ground cinnamon

• 1 tsp.

  pumpkin pie spice

• 1 tsp.

  kosher salt

• 1 tsp.

  baking powder 

• 1/2 tsp.

  baking soda

• 1/2 cup

  (1 stick) butter, softened

• 1 cup

  packed brown sugar

• 1/2 cup

  granulated sugar

• 4

  large eggs

• 1

  (15-oz.) can pumpkin puree

• 2 Tbsp.

  Fireball whiskey

For whipped cream frosting

• 12 oz.

  cream cheese, softened

• 1 1/2 cups

  powdered sugar

• 3 3/4 cups

  cold heavy cream

• 1/4 cup

  Fireball whiskey

• 1/4 tsp.

  ground cinnamon

• Pinch cayenne (optional)

• Pinch kosher salt

• Caramel, for drizzling

• Fireball nips, for serving