Preheat oven to broil.

Slice bagels in half horizontally. Spoon marinara sauce over each half, spreading in a thin layer.

Sprinkle each half with cheese and place on a baking sheet.

Cook in preheated oven on middle rack for 2-3 minutes or until cheese is melted and bubbly. Watch carefully so they don't burn!

Core and slice apples, then sprinkle with cinnamon; cut celery into sticks.

Serve pizza bagels with cinnamon apples and celery sticks on the side.