4tablespoons(1/2 stick) butterplus extra for greasing the pan
10ounces mini marshmallows
6cupscrispy rice cereal
2ounceswhite chocolate baking chocolatecandy coating, or melts, DIVIDED
16chocolate covered pretzels
Generously grease an 8-inch cake pan; set aside.
In a large pot set over medium heat, melt the butter. Add the marshmallows, stir to coat with the butter, and allow to completely melt, stirring frequently. Remove the pot from the heat and gently mix in the cereal until fully combined.
Transfer the mixture to the prepared pan and press into an even layer. Allow to cool completely. Run a thin knife or spatula around the edge of the pan, lay a platter or cutting board on top, and invert. Carefully lift off the pan.
Melt half of the white chocolate according to package directions. Spread a small amount of melted white chocolate on the back of the candy eyes and stick them to the top of one of the triangular Rice Krispie Treats. Do the same with the M&M nose and the pretzel antlers. Repeat for each reindeer.
Melt the rest of the white chocolate. Finish each reindeer by spreading some melted white chocolate between the antlers, covering with sprinkles, and gently pressing them to adhere. Allow the white chocolate to harden before serving the treats or storing them in an airtight container.