Line a 9x13 cake pan with tin foil. Spray the tin foil with nonstick cooking spray.
In a large saucepan, add in the butter over low heat. Let it melt.
Add in the bag of marshmallows and stir constantly until the marshmallows are melted and smooth. Remove from heat.
Add in the cake mix and red velvet bakery emulsion. Stir until combined.
Add in the rice krispie cereal and stir until the gooey marshmallow has coated all of the cereal.
Dump the rice krispie treats into the prepared pan.
Spray a piece of wax paper with nonstick cooking spray and press it against the rice krispie treats until they're firmly packed. Be sure to get the corners filled in too. Let the bars cool completely.
Cut the bars in half the long way and and then into 8 large bars.
Add the candy melts and heavy cream into a microwave-safe bowl and microwave for 30-second increments and stir after each time until the ganache is smooth.
Lay wax paper out on the counter to lay the bars to dry after they're dipped in the ganache.
Dip the end of the rice krispie treats into the ganache. Pick it up and let any excess ganache drip off.
Once the ganache is dried, dig in! Store in an airtight container.