Name: The BEST Green Bean Casserole
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Yield: 8 -12 servings
Ingredients: 2 pounds fresh green beans, trimmed and cut into bite-sized pieces; 1 batch Mushroom Alfredo Sauce (see below); 1 batch Crispy Onion Topping (see below); 1 tablespoon butter or olive oil, divided; 1 medium red onion, peeled and thinly-sliced; 1/2 cup Panko breadcrumbs; 1/4 cup freshly-grated Parmesan cheese; 1/4 teaspoon each fine sea salt and freshly-cracked black pepper; 2 tablespoons butter or olive oil; 8 ounces baby bella mushrooms, thinly sliced; 4 cloves garlic, pressed or minced; 3 tablespoons all-purpose flour; 1/2 cup vegetable stock; 1 cup milk (I used 2%, but any milk will do); 1/2 cup freshly-grated Parmesan cheese; 1/2 teaspoon fine sea salt; 1/4 teaspoon freshly-ground black pepper