Set instant pot electric pressure cooker to saute.
Heat olive oil and 2 tablespoons butter.
Cook onion and garlic until onion is soft and translucent.
Mix in rice and mushrooms. Turn instant pot off.
Pour in chicken broth and white wine. Stir.
Set instant pot to manual - 7 minutes.
Quick pressure release.
Mix in the remaining 2 tablespoons butter, Parmesan cheese, dried parsley, salt and pepper.