1. Heat oven to 350°F (325°F for dark or nonstick pans). Make and cool cake as directed on box for 24 cupcakes.
2. Frost cupcakes with frosting. Sprinkle chocolate shot over tops of cupcakes.
3. For each cupcake, cut pretzel twist in half; arrange on cupcake for reindeer antlers. Cut miniature marshmallow in half; arrange on cupcake for eyes. Center gumdrop below marshmallow halves for nose. Place red cinnamon candy below gumdrop for mouth. Store loosely covered.