Flounder with Spinach & Walnut Stuffing

Preheat over to 375 degrees F. Lightly coat an 8-by-11-inch baking dish with oil or coat with cooking spray.

If using fresh spinach, coarsely chop and shake in a colander to remove excess water. If using frozen spinach, squeeze it dry.

Heat oil in a large skillet over medium-high heat. Add walnuts and stir until lightly toasted, about 1 minute. If using fresh spinach, add to the pan, in batches if necessary, and toss until just wilted, about 2 minutes. If using frozen spinach, add and toss until heated through. Season with salt and pepper.

Place about 2 tablespoons of the spinach mixture over one half of each flounder fillet. Fold the other half over. Season with salt and pepper. Transfer the stuffed fillets to the prepared baking dish and scatter tomatoes over the top.

Cover with foil and bake until the fish is opaque in the center, 15 to 20 minutes.