Lightly brush the basket of an air fryer with vegetable oil. Preheat the air fryer to 400 degrees F.
While the air fryer is preheating, whisk together the egg whites and water in a shallow bowl.
Whisk the Panko breadcrumbs and Parmesan cheese together in a separate shallow bowl.
Dip each ravioli on both sides first in the egg and water mixture and then in the breadcrumb and cheese mixture.
Open the air fryer and place the coated ravioli in a single layer in the basket. You'll have to fry the ravioli in two or three batches, depending on the size of your air fryer.
Fry the ravioli for about 4 minutes, or until puffed and starting to brown.