Preheat the oven to 350°F. Line three 6 inch cake pans with parchment paper. Cut out circles the same size as the bottom of each pan, place them inside, and spray the pans with nonstick spray. Set aside.
In a medium bowl whisk together the flour, spices, baking soda, baking powder, and salt until fully combined. Set aside.
In a large bowl beat the brown sugar, molasses, egg, sour cream, vanilla, and oil on medium speed until smooth, about 2 minutes.
Add the dry ingredients, mix on low speed until just combined. scrape down the bowl, making sure to get the bottom.
Pour in the hot liquid [water and Irish cream or all water] and mix on low until the batter is smooth. Divide the batter evenly among the prepared cake pans.
Bake for 15 to 16 minutes or until a toothpick inserted in the center comes out clean. Allow the cakes to cool in the pans for about 10 minutes.
Place a plate or cooling rack on top of the cake pan. Hold the plate and pan together firmly, then flip them over in one motion. The cake should release and drop onto the plate because of the parchment lining. Gently lift the pan away, peel off the parchment, and let the cake finish cooling.