Created by KarenSTL on October 8, 2018
Step 1: Preheat oven to 375 degrees.
Step 2: Melt 1/4 cup of the butter in a large frying pan over medium-high heat.
Step 3: Add mushrooms and saute until limp. Add onion, dill, bread crumbs, salt, and pepper. Stir until thoroughly mixed.
Step 4: Add thawed and drained spinach, mix but do not cook spinach.
Step 5: Spray shallow round cake pan with cooking spray (or a similar pan with low sides). Spread spinach mixture over bottom. Arrange fish on top of spinach.
Step 6: Melt remaining butter and add lemon juice.
Step 7: Brush fish with lemon butter and bake, uncovered, basting several times with more lemon butter until fish flakes when prodded in the thickest portion with a fork. Cooking time is approximately 10 minutes per inch of fish thickness.
Step 8: Remove from oven and pour any remaining lemon butter over fish. Serve immediately