What you will need:
Place the cream cheese, mozzarella, feta, and chopped baby spinach into a large mixing bowl. Massage the spinach and the cheeses with your hands until they are well combined. Set aside.
Working one at a time, shape the portion of the stuffing into an egg shape and place it close to the tail of the fish. Then starting from the tail, roll each fillet up jelly-roll style and place it seam side down on the baking dish.
This Spinach Stuffed Flounder recipe is the best! A delicious mix of flaky white fish and creamy spinach filling, baked to perfection. This easy recipe is full of flavor and very versatile.