Shiitake Mushroom and Spinach Manicotti

Heat oven to 350°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. Cook and drain pasta shells as directed on package.

Meanwhile, tear bread into pieces; place in food processor. Cover; process until coarse crumbs form. Spread crumbs on cookie sheet. Bake 3 to 4 minutes or until toasted. Place crumbs in small bowl; set aside.

In 10-inch skillet, melt 3 tablespoons of the butter over medium-high heat. Cook mushrooms and garlic in butter until mushroom liquid is absorbed. Transfer mixture to large bowl. In skillet, melt remaining 1 tablespoon butter over medium-low heat; add spinach. Cover; cook 5 minutes or until wilted. Add spinach to mushroom mixture. Stir in ricotta cheese, Parmesan cheese, egg, 1/2 teaspoon of the salt and the pepper. Spoon mixture evenly into pasta shells. Place in baking dish.

In 2-quart heavy saucepan, melt 1/3 cup butter over low heat. Stir in flour with whisk until smooth. Cook 1 minute, stirring constantly. Gradually stir in half-and half. Cook over medium heat, stirring constantly, until thickened and bubbly. Stir in remaining 1/2 teaspoon salt. Add Gouda cheese; stir until melted. Pour sauce over stuffed shells.

Add cheese blend and melted butter to toasted bread crumbs; toss well. Sprinkle over shells. Bake uncovered 45 minutes or until bubbly.