For filling, in medium skillet melt the remaining 1 tablespoon butter over medium heat. Add the chopped zucchini, chopped soaked mushrooms, fresh mushrooms, and onion; cook about 5 minutes or until onion is tender. Stir in thyme, the remaining two cloves garlic, and the remaining 1/4 teaspoon salt. Cook and stir for 30 seconds. Remove from heat. Stir in 2/3 cup of the bread crumb mixture.