This Homemade Green Bean Casserole is filled with fresh green beans, mushrooms, thick-cut bacon, fried onions (lots of these), and topped with a crispy bacon Panko topping!
Remove the sauce from heat and pour in the buttermilk. Then add in the Parmesan cheese, ranch dressing mix, Dijon mustard, Worcestershire sauce, thyme, salt and pepper. Whisk to combine.