Green Bean Casserole by Instant Pot Eats

– 0.7 oz / 20 g butter (about 2 tablespoons )
– 1 large onion, peeled, halved and sliced thinly
– 1.5 teaspoon s sea salt
– 7-8 oz / 200 g button mushrooms
– 1.3 lb / 600 g green beans, tails cut off
– 2 large cloves of garlic, finely diced
– 1/2 cup onion or vegetable stock
– 1 teaspoon Dijon or yellow mustard
– 4-5 tablespoons of creme fraiche or sour cream
– 1 medium onion, peeled and sliced into thin rings
– 2 tablespoons tapioca flour or regular flour
– 1 teaspoon onion powder (optional)
– 1/2 teaspoon salt
– Generous pinch of pepper

Prep Time: 20 min
Cook Time: 15 min
Total Time: 35 min