Prepare the flax egg – In a small bowl, mix ground flaxseeds with water and let it sit for 5 minutes until thickened.
Mash chickpeas – In a large bowl, mash chickpeas with a fork until mostly broken down.
Shred hearts of palm – Use your hands or a fork to shred the hearts of palm into flaky pieces.
Mix everything – Add hearts of palm, panko, vegan mayo, mustard, lemon juice, flax egg, Old Bay, garlic powder, onion powder, dulse flakes, parsley, salt, and pepper to the bowl. Mix well.
Form patties – Scoop out portions of the mixture and shape into small patties (about 6-8 cakes).
Cook – Heat olive oil in a skillet over medium heat. Cook the patties for 3-4 minutes per side until golden brown and crispy.
Make the sauce – Mix vegan mayo, Dijon mustard, lemon juice, and Old Bay in a small bowl.
Serve – Enjoy warm with the dipping sauce and a squeeze of fresh lemon!