Preheat oven to 400°F. Line 2 baking sheets with parchment paper.

Completely defrost your squid rings. In a small bowl, whisk the 2 eggs and set aside. In a separate bowl, add the flour. In a third bowl, add the panko bread crumbs.

Lightly coat a squid ring in flour, tapping ring against side of the bowl when finished so that any excess flour comes off. Dip your squid ring in egg to coat and then also tap it a few times to get off any excess egg drippings (You want to be careful to not have too much egg on your squid ring because you don't want the bread crumbs to get too moist. If the excess egg drippings end up in the bread crumbs, it will cause them to clump up and then they won't stick to the squid.). Roll your squid ring a few times in the panko crumbs until fully coated. Place squid ring onto baking sheet. Repeat with remaining rings.

Bake for about 15-20 minutes until outer coating turns a golden brown. Flip rings over and bake an additional 10 minutes or until both sides are crunchy. Serve warm with tomato sauce. If desired, squeeze fresh lemon juice over finished calamari right before serving.