In a large sauté pan over medium high heat, slowly bring the beer to a boil. Add the cod filets and poach until the fish flakes easily with a fork, about 5-6 minutes. Remove the fish from the heat and set aside. Reserve 1 tablespoon of the poaching liquid
Transfer the fish to the bowl of a food process. Add chips, green onions, parsley, garlic, egg, Old Bay seasoning, pepper, and reserved poaching liquid. Pulse the food processor several times until pieces are uniform and ingredients are blended.
Heat oil in a large skillet over medium-high heat.
Form cod mixture into ¼-cup sized patties. Working in patches of about 3-5 patties, fry until patties are golden brown, about 2-3 minutes per side.
Remove patties from oil and allow to drain on a paper towel lined plate.