1. Preheat oven to 350 degrees and line pans with cupcake liners.
2. Sift cake mix into a small bowl and set aside.
3. In a large bowl, combine eggs, oil, vanilla extract, milk and sour cream until smooth.
4. Stir in cake mix.
5. Fill cupcake liners 3/4 full and bake for 16-20 minutes or until an inserted knife comes out clean.
6. Let cool.
7. Chocolate frosting: Beat butter. Add cocoa powder, 2 C. powdered sugar and milk. Slowly add more powdered sugar until you reach your desired consistency.
8. Prep reindeer "faces" by using frosting to stick brown M&M's on Nilla Wafers (some red for Rudolphs if you want). Melt down a few chocolate chips, put in a small plastic bag, snip off the tip to make a mini piping bag and "dot" little eyeballs on the white M&M's to make eyes.
9. Frost cupcakes.
10. (See photos below) Place Nilla wafers with M&M's on cupcakes, then place pretzels above. Use a little frosting to stick on 2 eyes and there you go!