Line a small baking tray or pan with parchment paper. A 9-inch pan works great, but a 13 x 9-inch pan gives you a thinner bark.
Melt the white chocolate until completely smooth, then spread it into an even layer in the prepared pan.
While the chocolate is still melted, scatter the crushed Oreo Firecracker Pop cookies, mini marshmallow bits, and patriotic sprinkles all over the top.
Finish with popping candy for that firecracker-style crunch and crackle.
Chill until fully set and hardened, then break into pieces and serve.