Spinach Mushroom-Stuffed Beef Tenderloin #ratingval# from #reviews# reviews Print Recipe Type: Entree Ingredients 1/4 pound fresh mushrooms, diced 2 tablespoons butter, melted 1/2 pound fresh baby spinach 1/4 cup grated Parmesan cheese 1/2 teaspoon fennel seeds 1/2 teaspoon ground sage 1/2 teaspoon salt 1/2 teaspoon freshly ground pepper 1 large egg, lightly beaten 1