• Prepare a 9×13-inch baking dish by spraying with nonstick spray.
• In a large pot, melt the butter over low heat. Stir in the vanilla extract.
• Add in the marshmallows and stir continuously until they have melted. Stir in the Rice Krispies cereal until coated with the marshmallow cream.
• Spoon the coated Rice Krispies into the prepared baking dish and gently press down to spread the mixture. Allow to cool for 30 minutes.
  
• Using a spatula, gently loosen the edges of the treats. Turn the dish over onto a clean cutting board. Use a large knife to trim the edges so they are straight. Set aside the trimmed pieces.
  
• Cut the block of treats down the middle the long way. This will split the treats into two pieces. Cut each section on an angle to form triangle-shaped pieces.
  
• Place the white chocolate melts into a microwave-safe container. Follow the directions for your brand of white chocolate melts. If they do not have directions, then microwave for 1 minute at 50% power or on the defrost setting. Stir well. If not melted, place in the microwave for 30 seconds and stir again.
  

To Decorate The Treats:

• Place a small amount of melted chocolate on the back of one corner of a mini pretzel and stick it to a corner of the treat (opposite the point of the triangle) to make an antler. Repeat for the other side.
• Using a spoon or a toothpick, place a small amount of melted white chocolate on the back of each eye and position them on the reindeer.
  
• Using a spoon or a toothpick, place a small amount of the melted white chocolate on the side of the M&M that has the printed logo. Press the red or brown M&M on the tip of the triangle to make the nose. Some will be Rudolph the reindeer (red nose) and others will be one of the other reindeer that pull Santa’s sleigh (brown nose).
• Place the decorated treats on a baking sheet and put them in the refrigerator for 5 to 10 minutes to harden the chocolate. Serve and enjoy!