If the ravioli are not frozen, freeze one hour before making (for either homemade or store bought).
Whisk together the eggs and buttermilk in a shallow dish. In another shallow dish, whisk together Parmesan cheese, breadcrumbs, salt, and pepper.
Dip frozen raviolis into egg mixture and dip into the breadcrumbs, making sure all sides are coated.
If Deep Frying:
Once all raviolis are coated, place on a sheet pan and put back in freezer while you heat your oil.
In a heavy bottomed pot, add enough oil so it's 2 inches deep. Heat oil over medium high until it's 375℉. When hot, add ravioli in batches so as to not overcrowd.
Fry for 3 - 4 minutes or until golden brown, turning halfway through. Remove and add to a paper towel-lined plate. Repeat until all done.
If Air Frying:
Preheat your air fryer to 375℉. Once ready, spray the inside of the fryer with oil, and add enough raviolis so they aren't overcrowded. Spray the tops with a little oil.
Air fry for 5 minutes, flipping halfway through. Remove and add to a paper towel-lined plate. Repeat process until all are done.
For serving:
Serve topped with more Parm and dunked in marinara.