Prepare the Tray

1. Line a baking tray with parchment paper to prevent sticking.

Layer the Chocolates

1. Begin by melting the semi-sweet chocolate morsels. You can do this in a microwave in 30-second bursts, stirring between each, until smooth.
2. Pour the melted semi-sweet chocolate onto the prepared tray, spreading it into an even layer.
3. Allow this layer to harden completely. You can speed up this process by placing the tray in the refrigerator.

Add the White Chocolate Layer

1. Melt the white chocolate morsels using the same method as before. Once melted, pour it over the hardened semi-sweet chocolate layer.
2. Let this white chocolate layer harden completely before proceeding.

Drizzle the Candy Melts

1. Melt the red, white, and blue candy melts separately. You can use small piping bags or a spoon to drizzle each color over the hardened white chocolate layer. 
2. Use a toothpick to swirl the colors gently, creating a marbled effect. Do this before the candy melts harden to ensure a smooth pattern. 

Decorate

1. Sprinkle the red, white, and blue star sprinkles and M&Ms over the top while the candy melts are still slightly soft to ensure they stick. 

Final Hardening

1. Allow the entire tray to harden completely, either at room temperature or in the refrigerator if you’re in a hurry.

Break into Pieces

1. Once fully set, lift the bark out of the tray using the edges of the parchment paper and break it into pieces by hand.

Serve and Enjoy

1. Your colorful chocolate bark is ready to be served! Store any leftovers in an airtight container at room temperature or in the fridge.