Cook pasta shells according to package instructions
In a blender or food processor, add the crumbled tofu (I just used my hands to break up the tofu), nutritional yeast, salt, garlic, and Italian seasoning. If using a blender, start on the slow speed and gradually increase to a higher speed. Be sure to scrape down the sides halfway through. * If you feel like you need to add liquid, add 1-2 tsp of veggie broth at a time. Be careful not to make it too thin*
Add in the chopped spinach and pulse 1-2 times if using a food processor and just blend for 10-15 seconds if using a blender/Vitamix - you should be able to see the spinach pieces in your ricotta.
Start stuffing the shells with either a spoon or piping bag.
In a cast iron skillet, deep baking dish, or any other deep pan - add some of the marinara sauce to the bottom
Add the stuffed shells in your preferred way and top with additional marinara sauce