Line an 8 x 8-inch pan with plastic wrap (or aluminum foil). Set aside.

Combine banana, peanut butter, cocoa powder, and Shakeology in a medium bowl; mix well with clean hands or a rubber spatula.

Press chocolate mixture into prepared pan. Cover with plastic wrap and press down to flatten into pan. Refrigerate for 1 hour so that brownies set.

Cut into sixteen brownies.