Spray a baking dish (8"x8" or 9"x13") with nonstick cooking spray. If you'd like to lift the brownies from the pan, line it with parchment paper.
Bake a batch of brownies according to the directions on the box. Let brownies cool in the baking dish for 1 hour.
Trim off the brownie edges if you'd like. I find that they are generally a little crispy and don't roll into balls as easily as the center section, but it's up to you.Using a fork, mash brownies and mix until they are soft and scoopable. They should look like cookie dough.
Scoop balls of brownies using a tablespoon-sized cookie scoop.
Roll into a ball using your hands and place brownie balls on a cookie sheet lined with parchment paper or wax paper.
Freeze for 15 minutes. They should be hard to the touch (and chilled) but not frozen.
Place chocolate candy melts or chocolate chips in a microwave-safe bowl. I like adding a teaspoon of coconut oil when using chocolate chips because it gives the chocolate an even smoother consistency, but it's completely up to you. Candy melts are easy to work with, regardless.
Melt chocolate candy melts in the microwave for 30 seconds. Stir. Heat for another 30 seconds (in 15-second increments) and stir until melted and smooth. It's better to underheat the chocolate vs. overheat. If your candy melts are ALMOST melted, just keep stirring. They'll keep melting as you stir, without having to put them back into the microwave.
Dip chilled brownie truffles into chocolate. Place back onto parchment-lined baking sheet.
Sprinkle truffles immediately with sprinkles or other toppings before the chocolate hardens. Place them back on the cookie sheet and allow them to set up completely.
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Notes
Brownie truffles can be stored at room temperature on the counter for up to 3 days. You can also store them in the refrigerator or freezer.