Prepare the brownie mix according to the package's instructions.
Add in chocolate chips and stir to combine.
Either grease or line your mini muffin tin with 24 muffin wells with paper liners.
Spoon the brownie mix into the muffin tin.
Bake at 350F for 18-20 minutes. Let cool.
Place the vanilla frosting in a pastry bag fitted with a 1M open star tip. Pipe some vanilla frosting onto the brownie bite in a circle.
Slice the green stems off of the strawberries. Place a strawberry on top of each brownie bite.
Pipe a small dollop of frosting on top of the strawberry for the ball of the hat. Serve immediately or refrigerate until ready to serve.