Lay parchment paper down on a cookie sheet. Melt semi-sweet chocolate in the microwave until smooth. Spread melted semi-sweet chocolate in an even layer so it covers the majority of the sheet. Refrigerate for 1 hour.
After 1 hour remove the tray from the refrigerator, it should be solid. Melt white chocolate in the microwave and spread it on top of the semi-sweet chocolate in a even layer.
Add drops of red and green food dye (about 7-10 of each) all over the white chocolate and use the tip of a butter knife to swirl them together. Top with M&M's, Sprinkles, Crushed Peppermint, and Chocolate Chips. Refrigerate for another hour.
Remove from refrigerator and either cut or break the bark in chunks. I like to pull mine out of the cookie sheet first. Store in the refrigerator until time to serve or gift. Enjoy!
Leftover Storage: Store leftovers in the fridge for 2-3 weeks.
Freezer Option: Store in a freezer bag and enjoy bark for up to 6 months.
Alternate Toppings: If you would rather use different topping than the ones I have suggested, go for it! Some great options include crushed Oreos, different colored food coloring, Reeses or any of your favorites!