To prepare a pistachio whiskey cake baked goods recipe, first you need to prepare the ingredients for the cake. Preheat the oven to 350 degrees F (180 degrees C) and grease and flour two 8-inch round cake pans. Sift the flour, baking powder, sugar, salt and cinnamon into the bowl of an electric mixer. Add the butter and mix on medium-high speed until the mixture is light and fluffy, about 2 minutes. Gradually add the milk, beating well after each addition. Pour in the eggs and vanilla, mixing just until combined. Bake the batter for 30 minutes, or until toothpick inserted in center comes out clean. Let the cakes cool before removing them from the pan.