Preheat oven to 350ºF. Line 24 muffin cups with paper liners.
In a large mixing bowl, whisk the cake mix, cocoa, ginger, cinnamon and nutmeg together until well combined. Add 1/2 cup softened butter and mix with an electric mixer until it resembles small pea-sized crumbs. Add eggs, buttermilk, orange zest, orange juice and molasses. Start mixing on low speed, then increase to medium. and mix until smooth, about 2 minutes. Fold in mini chocolate chips. Divide batter evenly into prepared pans filling each cup ½ to 2/3 of the way full. Do not overfill. Bake cupcakes in a 350°F oven for 15 minutes or until a toothpick comes out clean when inserted into the middle of a cupcake. Transfer baked cupcakes to a wire rack to cool completely. When cupcakes are cool, cover them generously with vanilla frosting, either with a pastry bag and tip or with a butter knife. Use holiday sprinkles if desired.
Best eaten the day they are made, but will keep covered in an airtight container for up to 3 days.
Fluffy Vanilla Frosting
In a medium bowl cream 1-1/2 cups softened butter with electric mixer until light and fluffy. Add in cream, powdered sugar, vanilla and a pinch of salt and beat until smooth and creamy, about 3-5 minutes.