Heat oven to 425°F (220°C). Line two sheet pans with parchment for easy cleanup.
Brush cut sides of bagels lightly with olive oil. Arrange cut-side up and bake 5–7 minutes until lightly crisp. This step keeps them from turning into sauce sponges.
Stir oregano, garlic powder, and a pinch of salt/pepper into the marinara. If your sauce is thin, simmer 5 minutes to tighten it up.
Spread 1–1.5 tablespoons sauce on each bagel half. Sprinkle mozzarella generously, then dust with Parmesan. Add a tiny pinch of red pepper flakes if you like drama.
Return pans to the oven for 8–10 minutes, until cheese is melted and bubbling. Rotate pans halfway for even browning.
Optional but clutch—broil 1–2 minutes to get those golden spots. Watch closely. This is not a time for texting.
Shower with chopped basil and a crack of black pepper. Stir olive oil and red pepper into warmed marinara for dipping. Serve hot.