Preheat your oven to 375°F (190°C).
Slice the bagels in half horizontally and place them cut-side up on a baking sheet lined with parchment paper.
Spread a tablespoon of pizza sauce on each bagel half, ensuring even coverage.
Sprinkle shredded mozzarella cheese generously over the sauce on each bagel half.
Using the black olives, create eyes for the ghosts by placing two olive slices on each bagel half, adjusting the positioning for a spooky effect.
Add pepperoni slices below the olive eyes to resemble ghostly mouths.
Sprinkle garlic powder, Italian seasoning, salt, and pepper over the cheese for extra flavor.
Bake in the preheated oven for about 10-12 minutes, or until the cheese is bubbly and slightly golden.
Remove from the oven and garnish with fresh basil for a touch of color and freshness.
Serve immediately while warm, and enjoy the hauntingly delicious flavors!