Ingredients 1 tablespoon olive oil 1 cup chopped onion 6 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 teaspoon dried oregano 8 ounces whole-grain spaghetti or linguine (such as Barilla) 1/2 teaspoon salt 10 ounce fresh spinach 1 ounce Parmesan cheese, […]