One-Pot Pasta with Spinach and Tomatoes

INGREDIENTS

1 tbsp

olive oil

1 cup

chopped onion

garlic cloves, finely chopped

1 14.5 ounce can

unsalted petite diced tomatoes, undrained

1 1/2 cups

unsalted chicken stock (such as Swanson)

1/2 tsp

dried oregano

8 oz

whole-grain spaghetti or linguine (such as Barilla)

1/2 tsp

salt

10 oz

fresh spinach

1 oz

Parmesan cheese, grated (about 1/4 cup)