Cut the bread in half lengthwise, then cut each half crosswise in 2 pieces to give you 4 pieces total. Slice the cheese into strips.
Place the bread, cut side up on a baking sheet. Spread 1/4 cup of marinara sauce on each piece.
Place 2 slices of olives on each pizza to make eyes. Randomly lay out the mummy cheese strips over the sauce. Bake in the center rack until the cheese is melted and bubbling, and the bread is crisp, about 8 minutes.