A fresh, from-scratch green bean casserole with a silky mushroom sauce and homemade crispy fried shallots. Lighter and more flavorful than the classic canned soup version, perfect for holidays or weeknight dinners.
The sauce will look thin before baking but thickens as it cooks. For make-ahead: blanch beans and fry shallots up to 3 days ahead; make sauce up to 2 days ahead. Store fried shallots in an airtight container at room temperature. Add them just before serving to keep them crispy.
Keywords: green bean casserole, crispy shallots, from scratch, holiday side dish, vegetarian, lighter, Thanksgiving