Place the semi sweet chocolate chips in a microwave-safe bowl. Melt in 30-second bursts in the microwave until completely melted.
Pour the melted chocolate into a lined springform pan or baking dish and tap to release bubbles.
Melt white chocolate melts in a microwave-safe bowl. Melt in 30-second bursts in the microwave until completely melted.
Spread with an offset spatula until ¼ inch thick. (This will make for a thinner bark. You may make yours thicker, but you will have less pieces and it will also take longer to solidify.)
While the chocolate is still wet, drizzle half the melted white chocolate over the semi sweet chocolate.
Then sprinkle m&m's and sprinkles on top.
Drizzle the remaining melted white chocolate and finish with the candy eyeballs.
Allow to cool and set at room temperature or in the refrigerator for about an hour.
Once set, chop with a sharp knife into 1-2” irregularly sized pieces.
Store in an airtight container in the refrigerator until ready to enjoy.