Preheat oven to 425°F and arrange bagel halves cut-side up on a rimmed baking sheet; toast until lightly golden, about 3–5 minutes.
Assembling & Baking
Spread about 1 tablespoon of pizza sauce onto each bagel half, creating a thin, glossy layer.
Tear mozzarella into ghost shapes with arms and place on top of sauce.
Press two olive slices into each cheese ghost for eyes.
Bake until cheese is melted and bubbling around the edges, about 5–7 minutes.
Notes
During testing, pre-toasting the bagels prevented soggy bases.Store cooled bagels in an airtight container in the fridge for up to 3 days; reheat at 350°F for 5 minutes.