Green Bean Casserole with Mixed Mushroom Gravy

5 from 1 vote

This Green Bean Casserole with Mixed Mushroom Gravy is the perfect holiday side dish! This is a classic dish that is jam-packed with flavor.

Prep Time15

Cook Time30

Total Time45

Course: Side Dish

Cuisine: American

Servings: Servings

Calories: 281kcal

Preheat the oven to 450°F.
Add 3 cups water to a medium-sized pot and bring to a boil over high heat. Add several pinches of kosher salt. Add the frozen green beans and return to a boil. Continue to cook for 6-8 minutes until soft, then strain and allow to dry for several minutes.
Toss the beans in several teaspoons of neutral oil or unsalted butter until evenly coated. (The oil or butter prevents the green beans from squeaking.) Season with kosher salt and fresh cracked black pepper. Set aside.

While the green beans are cooking, heat a large skillet over medium-high heat until thoroughly heated through. (A few drops of water should scatter across the pan, but it should not be smoking hot.) This ensures that the mushrooms sear properly. If the pan is too cool, the mushrooms will begin to release their liquid before they have a chance to brown. Add the butter and melt.
Once the butter is melted, add the mushrooms and cook undisturbed for approximately 2 minutes to sear the mushrooms on one side. Stir and continue to cook for an additional 5 minutes.
Add in the fresh thyme and garlic and continue cooking for 1 minute, until fragrant.
Stir in the kosher salt, fresh cracked black pepper, cayenne, and nutmeg. Cook for an additional 2 to 3 minutes.
Sprinkle the flour evenly over the mushrooms as they begin to release their liquid, stirring to combine.
Gradually add the chicken stock while stirring and scraping constantly to deglaze the pan. Bring to a boil, then adjust the heat to a low simmer.
Add the sour cream and heavy cream, stirring to combine. Cook over medium-low for approximately 5 minutes until the gravy thickens slightly. Remove from the heat and add the prepared green beans to the pan, stirring until evenly coated.
Adjust salt and pepper to taste.
Transfer the mixture to a 9x13-inch casserole dish.

Sprinkle the green beans with parmesan and bake for 10 minutes until the casserole is bubbly and the top is melted and beginning to brown.
Add the French's Crispy Fried Onions over the top and return to the oven for an additional 5 minutes.
Remove from the oven, allow to cool for approximately 5 to 10 minutes, and serve.