In a small bowl, whisk together all of the "Wet" ingredients along with the salt and pepper.
In a medium bowl, gently break apart the lump crab so that it's flaky. You'll also be on the lookout for any shell fragments. Add the panko, parsley and scallion. Lightly toss together.
Add wet ingredients to the crab bowl and using a fork, combine well.
On a sheet tray using a round 3" ring mold or cookie cutter, fill the mold with the mixture and tamp down to make a uniform "hockey puck". Not too hard, just compress it enough so that it holds together when you remove the ring. Repeat with rest of crab cakes. You should be able to make 8.
Place tray in fridge to firm up the cakes before frying. 15-20 minutes should do.
Preheat oven to Low - 200F.
In a large cast iron over Medium heat, bring avocado oil to temp and add butter. Working in batches of 3-4, fry each side until golden, about 2-3 minutes per side. Don't move them while in the pan until turning! Be gentle turning them so they don't break apart. I use a fish spatula.
Place on paper towel lined sheet tray in warm 200F oven to hold while doing next batch.