If you don’t have vegetable broth on hand, chicken broth or stock will also work as a substitute. Gruyere cheese is an earthy, nutty, and slightly salty cheese, although a little on the pricier side. If you’re opting for a substitute, a combination of Fontina and Parmesan is an excellent choice. The shredded parmesan has the pep and consistency, while the fontina has a rich flavor that makes it a creamy substitute for adding an extra pop of flavor! Another alternative method is to use a stick blender. Ensure the blender’s bottom blade area remains level to prevent spattering, pulse the tool on and off, and move it around the pot to puree the spinach and onion until it’s smooth. An additional option for making the soup with a hearty and rustic creamed spinach vibe is to skip the puree and make a chunky spinach soup instead.