Tortellini in mushroom sauce without juice mayonnaise

3 tablespoons butter , divided 1/2 cup chopped onion 4 cloves garlic , minced 1 (14 ounce) can tomato sauce 2 cups sliced fresh mushrooms 1/4 cup chopped[...]

1 link Johnsonville® Three-Cheese Italian Style Sausage (from 13.5 oz. pkg.), thinly sliced 2 tablespoons olive oil 1 medium onion, cut into 1/4-inch[...]

8 ounces tortellini 1 (10 1/2 ounce) can cream of mushroom soup 2/3 of can milk (10.5 oz) 8 ounces mozzarella cheese (2 cups grated) 3 tablespoons parmesan[...]