Casserole, Green Bean and Mushroom I

Ingredients

• 4 slices sandwich bread with crusts, each slice torn into quarters
• 2 tbsp. unsalted butter, softened
• 1/4 tsp. salt
• 1/8 tsp. ground black pepper
• 3 cups canned fried onions (about 6 oz.)
• Salt
• 2 lbs. green beans, ends trimmed, cut on the diagonal into 2" pieces
• 1/2 ounce dried Porcini mushrooms
• 6 tbsp. unsalted butter
• 1 medium onion, minced
• 3 medium garlic cloves, minced (about 1 tbsp.)
• 12 oz. white button mushrooms, wiped clean, stems trimmed, and sliced 1/4" thick
• 12 ounces Cremini mushrooms, wiped clean, stems trimmed, and sliced 1/4" thick
• 2 tbsp. minced fresh thyme leaves
• 1/4 tsp. ground black pepper
• 2 tbsp. all-purpose flour
• 1 cup vegetable broth
• 2 cups heavy cream