INGREDIENTS
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3 to 4 medium shallots, in their skins
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Kosher salt, plus 1 1/2 teaspoons
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1 pound fresh green beans, stemmed, and halved crosswise
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1 tablespoon extra-virgin olive oil
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8 ounces cremini mushrooms, sliced (about 4 cups)
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2 tablespoons unsalted butter
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3 tablespoons all-purpose flour
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1 1/2 cups mushroom, vegetable, or chicken broth (see Cook's Note)
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3 teaspoons fresh thyme leaves
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Freshly ground black pepper
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Vegetable cooking spray
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1 cup fresh bread crumbs