• Preheat the oven to 350 degrees and prepare a 24 count muffin pan by filling the openings with cupcake liners.
• In a large bowl, combine cake batter according to the box directions.
• Scoop batter into the cupcake liners.
• Bake the cupcakes for 21 minutes. Remove from oven and let cool.

Make the Frosting

• Using a standing mixer or hand mixer, combine the butter, powder sugar, vanilla, heavy whipping cream, and powder sugar. Mix until a stiff peaks form.
• Separate the frosting into two bowls, add green food coloring into one bowl and leave the other bowl of frosting white.
• Add the green frosting into a piping bag fitted with a star tip and set aside.
• Scoop the white frosting into a piping bag fitted with a large round tip.
• Using the white frosting, pipe a circle in the middle of the cupcake to make a "Butt". Dip the cupcake into the shredded coconut.
• Using the green frosting, pipe "grass" around the tail.
• Place the mini marshmallow in the center of the butt for a tail.
• Place two candy bunny feet on the bottom sides attaching to the green grass frosting.