This is a wonderful and easy appetizer. The only thing that I changed in the recipe was adding a sprinkle of Kosher salt and freshly ground black pepper.

RECIPE INGREDIENTS
1/2 pound torn fresh spinach
2 tablespoons water
3/4 cup reduced-fat ricotta cheese
3 tablespoons butter or stick margarine, softened
1 egg
2/3 cup grated Parmesan cheese
1/2 cup water chestnuts, chopped
1/3 cup finely chopped pecans, divided
56 large fresh mushrooms (about 3 1/2 pounds)
Refrigerated butter-flavored spray

Spinach Cheese Mushrooms Recipe at Cooking.com
DIRECTIONS
In a saucepan, bring spinach and water to a boil. Reduce heat; cover and cook for 3 minutes. Drain; squeeze dry and finely chop.