Instant Pot Tomato Basil Soup

INGREDIENTS

2 tsp

olive oil

1 tbsp

unsalted butter

1 cup

finely diced celery

1 cup

finely diced carrots

1 cup

finely diced onions

2 tbsp

all purpose or gluten-free flour

3 1/2 cups

reduced sodium chicken broth (or vegetable for vegetarians)

1 3/4 cups

reduced fat (2%) milk

28 oz

can San Marzano whole plum tomatoes, with juice

sprig fresh thyme

1/4 cup

fresh basil, chopped

bay leaves

Parmesan or Romano cheese rind (optional)

1/3 cup

grated Pecorino Romano cheese

3/4 tsp

kosher salt, or more to taste

fresh black pepper,