Combine the flour, salt, garlic powder, and parsley flakes. Mix well and set aside.
Heat the cooking oil in a wok or a deep cooking pot.
Drain the milk of the calamari. Dredge the calamari rings one-at-a-time on the flour mixture. Make sure that the calamari ring is completely coated with the mixture.
Deep fry the coated calamari rings on hot oil for 2 minutes or until the calamari turns light brown.
Strain the calamari from the wok or cooking pot using a skimmer or strainer. Let the excess oil drip.