Gather and prep the ingredients: sort out the red m&m's, collect whole (unbroken) pretzels, and unwrap the Twix candies. Set aside.
Chop the candy coating into smaller squares, then place it in a microwave safe bowl. Melt over medium heat, stirring every 30 seconds to prevent scorching.
Once the chocolate is fully melted, spread it evenly onto a rimmed baking sheet lined with wax paper, about 1/4 inch thick. *Reserve 1-2 Tablespoons for assembly.
Let the chocolate cool for about 2 minutes, then arrange the Twix and pretzels to form reindeer heads.
Once the heads are assembled, sprinkle the white chocolate with colored sprinkles.
Stick the candy eyeballs and noses to the Twix bars using a toothpick dipped in melted chocolate.
Set aside to harden completely, then cut into individual pieces.