Preheat oven to 350 degrees. Line a 9x13 pan with tin foil. Spray with nonstick cooking spray with flour.
Place the brownie batter into the prepared pan and bake for the recommended time.
Remove from the oven and let cool completely.
Pull the brownies out of the pan by lifting on the tin foil.
Turn out onto a piece of wax paper or parchment paper that's on top of a cookie sheet. This will help move it.
Remove foil and replace with a piece of wax paper or parchment paper.
Roll between 1/4 and 1/2 of an inch.
Melt 1/2 cup of each candy melts in individual microwave-safe bowls in 30-second increments. Stir after each increment in the microwave.
Once all the lumps are gone, add in the coconut oil starting at 1 1/2 teaspoons. Add 1/2 teaspoon more of the coconut oil if the candy melts don't flow off the spoon but instead just plops off.
Add the different colors of candy melts in spoonfuls all over the brownie bark. Tap on the counter to spread the candy melts all over.
Start adding the gummy eyes and sprinkles to the top of the candy melts. I placed mine in a bowl and placed the cute pumpkins, ghosts, mummies, and eyes on to make sure they were facing up and then just sprinkled the rest all over.
In the same bowl you used for the first black candy melts, heat up the remaining 1/4 cup of black candy melts in 30-second increments. Stir after each increment.
Once smooth, add in 1/2 teaspoon of coconut oil and stir to combine.
Add into a sandwich bag and cut a small hole in one of the corners. Begin piping stitches on any of the spots where two colors come together. I piped frosting over top of sprinkles too.
Let the candy melts harden.
Cut and serve the brownie bark!
If you find that the candy melts are too thick to spread out by tapping once they've been added to the brownie, use a piece of wax paper and spread the candy melts out that way. It will blend the colors of candy melts though.