Lightly coat the inside of your plastic face mask with cooking spray, then press plastic wrap firmly into every contour, especially the nose and eye sockets. This step keeps your cheese ball from sticking and gives it that smooth, skin-like finish once unmolded. Take your time here — a well-lined mask makes unmolding so much easier later.
Set aside two or three prosciutto slices for later touch-ups, then tear the rest into strips. Lay the strips into the mask to mimic raw muscle, starting around the eyes and working outward to the cheeks, chin, and forehead. Leave the eye sockets bare for now, since the olives go in next.
Nestle a whole pimento-stuffed green olive into each eye socket, pimento side facing down. This little detail is what makes the finished cheese ball genuinely unsettling. Set the mask aside gently so the olives don't shift out of place.
In a large bowl, combine the softened cream cheese, shredded Cheddar, and shredded Havarti. Add the chopped green olives and roasted red peppers, then mix with an electric mixer or clean hands until fully combined. The mixture should be smooth, thick, and easy to scoop.
Take a heaping spoonful of the cheese mixture and pack it around one olive to form an eyelid, then repeat on the other side. Gently add handfuls of the remaining mixture around the mask, pressing carefully so you don't disturb the prosciutto strips underneath.
Press the cheese mixture firmly into every crevice of the mask so there are no air pockets. Smooth the back so it sits flat once flipped. Cover and refrigerate for at least 30 minutes, though I usually give mine a full hour for a cleaner release.
Invert the mask onto your serving platter and carefully peel away the mask, then the plastic wrap. If any bare cheese peeks through at the edges, patch it with your reserved prosciutto strips for a cleaner, more realistic finish. Serve immediately with a small knife nearby.