Preheat oven to 350 degrees.Cream together butter, sugar and brown sugar in a medium/large bowl until smooth. Add in eggs one at a time. Stir in eggnog and vanilla.In a separate bowl whisk together flour, baking powder, salt, cinnamon, and allspice. Add dry ingredients to the wet ingredients ½ cup at a time, until it’s all combined.Spray 4- 5?x3? mini loaf pans or two larger loaf pans with non stick cooking spray. I prefer the Pam for Baking (with flour).Divide batter evenly among pans and bake for 30-40 minutes or until toothpick comes out clean when tested from the center. Let cool on wire rack before removing from pan.If desired, you can drizzle the tops with melted chocolate for a little added sweetness.