Green Bean & Mushroom Casserole - Gluten Free

Gluten-Free Version of Trader Joe's Holiday Green Bean & Mushroom Casserole 

1-1/2 Tablespoons butter

1-1/2 Tablespoons olive oil

8 ounces mushrooms, sliced

1/3 cup onion sliced

24 ounce fresh green beans

2 cups gluten-free cream of mushroom soup (click here for gluten-free recipe)

1-1/2 cup Swiss cheese, shredded

1-1/2 to 2 cups gluten-free fried onion pieces (click here for gluten-free recipe)

• Preheat oven to 375 degrees F.
• Heat olive oil and butter in large skillet.
• Add mushrooms and saute until they become soft and lightly browned. 
• Add onion and continue to saute until they become soft and lightly browned.
• Add green beans and saute until heated through.
• Add soup, mix, and cook until heated through. 
• Add mixture to a medium size casserole dish.
• Top with cheese and fried onion pieces.
• Place in oven and bake until cheese melts and becomes warm and bubbly, about 15-20 minutes.