In a medium saucepan cook mushrooms, onion, and garlic in margarine or butter until tender. Stir in flour, bay leaf, nutmeg, and pepper. Add vegetable or chicken broth and half-and-half, light cream, or milk all at once. Cook and stir until mixture is thickened and bubbly.
Add shrimp. Cook for 2 minutes more. Add spinach and Gruyere cheese. Cook and stir until spinach wilts and cheese melts. Remove and discard bay leaf. Makes 4 servings.