Preheat the air fryer to 375°F (190°C).
Prepare the shrimp by seasoning with garlic powder, salt, and pepper.
Spread the marinara sauce evenly over the pizza crust.
Add the seasoned shrimp, bell peppers, and red onion on top of the sauce.
Sprinkle the mozzarella cheese generously over the top.
Place the pizza in the air fryer basket and set the timer for 10-12 minutes.
Check for doneness; the shrimp should be opaque and no longer translucent.
Once done, let the pizza cool for a few minutes before slicing.
Garnish with fresh basil leaves before serving.