Combine ingredients and whisk together to make the Imperial sauce. Gently fold in crabmeat and bread crumbs just enough to combine. Let chill in fridge for 30 minutes or overnight.
Lay the flounder filets presentation side down and place 1/4 of the crab imperial mixture in the widest part of the flounder filet. Next fold over the thinnest part of the flounder over the crab imperial and continue rolling to form a cylinder shape.
Place stuffed flounder filets on a sheet tray lined with parchment paper. Spray with cooking oil and dust with old bay seasoning. Bake for 25-30 minutes until the center of the stuffing has reached 145 Degrees F. Internal temperature. Let rest for about 3-5 minutes before plating
Notes
Each filet should be around 6-8oz with about 4oz of crab stuffing in each filet.