This cozy autumn crispy green bean casserole features tender-crisp green beans, a rich from-scratch creamy mushroom sauce, and a homemade crispy onion topping. It’s the perfect side dish for fall gatherings and holidays, converting even the biggest skeptics.
Don’t skip blanching the green beans for perfect tender-crisp texture. Warm the milk before adding to the sauce to prevent lumps. Fry onions in small batches to ensure even crispiness. Make the sauce slightly thinner than desired as it will thicken during baking. Let the casserole rest for 5 minutes before serving to allow the sauce to set. For make-ahead: assemble without crispy onions up to 24 hours in advance, refrigerate, then add onions and bake at 375°F for 30-35 minutes. Leftovers keep in the refrigerator for up to 4 days.
Keywords: green bean casserole, crispy green bean casserole, homemade green bean casserole, fall side dish, Thanksgiving side dish, creamy mushroom sauce, crispy onions