Heat oven to 350°F.
In a medium saucepan, heat olive oil over medium heat Remove from heat.
Stir in gluten free flour, onion, salt, pepper and soy sauce
Cook, stirring constantly, until mixture is bubbly; remove from heat
Stir in broth and milk substitute
Heat to boiling, stirring constantly. Boil and stir for 1 minute
Stir in mushrooms
In an un-greased, 1 1/2-quart casserole dish, mix soup and green beans.
Bake about 30 minutes or until hot and bubbly. Stir.
Sprinkle fried onions over the top of the casserole. Bake about 10 minutes longer or until onions are golden brown.