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Topping:
Filling:
Make Topping:
Make Filling and Assembly:
Bring 4 quarts of water to boil in large pot. Add 2 tbsp. salt and beans. Cook until bright green and slightly crunchy, 4 to 5 minutes. Drain beans and plunge immediately into large bowl filled with ice water to stop cooking. Spread beans out onto paper towel-lined baking sheet to drain.
Meanwhile, cover dried Porcini with 1/2 cup hot tap water in small microwave-safe bowl; cover with plastic wrap, cut several steam vents with paring knife, and microwave on high power for 30 seconds. Let stand until mushrooms soften, about 5 minutes. Lift mushrooms from the liquid with fork and mince using chef's knife (you should have about 2 tbsp.). Pour liquid through paper towel-lined sieve and reserve.
Melt butter in large nonstick skillet over medium-high heat until foaming subsides, about 1 minute. Add onion, garlic, button mushrooms, and Cremini mushrooms and cook until mushrooms release their moisture, about 2 minutes. Add Porcini mushrooms along with their strained soaking liquid, thyme, 1 tsp. salt, and pepper and cook until all mushrooms are tender and liquid has reduced to 2 tbsp., about 5 minutes.
Add flour and cook for about 1 minute. Stir in vegetable broth and reduce heat to medium. Stir in cream and simmer gently until sauce has consistency of dense soup, about 15 minutes.
Arrange beans in 3-quart gratin dish. Pour mushroom mixture over beans and mix to coat beans evenly. Sprinkle with bread crumb mixture and bake until top is golden brown and sauce is bubbling around edges, about 15 minutes. Serve immediately.
Poster's Notes:
Posted by Ron Chazen
Nutritional Info Per Serving: N/A
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
Pulse bread, butter, salt, and pepper in work bowl of food processor fitted with metal blade until mixture resembles coarse crumbs, about ten 1-second pulses. Transfer to large bowl and toss with onions; set aside.
Heat oven to 375°F.
All the components of this dish can be cooked ahead of time. The assembled casserole needs only 15 minutes in a 375°F oven to warm through and brown. A gratin dish works nicely with this recipe.