Preheat the oven to 350 degrees. Prepare the manicotti shells according to the instructions on the package.
In a large bowl, combine the tofu crumbles, lemon juice, soy milk, nutritional yeast, and spices. Mash until a smooth consistency.
In a casserole dish with a lid, pour half of the Dave's awesome pizza sauce into the bottom and spread evenly.
Stuff each manicotti shell with the tofu mixture and place into the casserole dish. Spread the remaining marinara sauce over the top of the shells, covering the edges well. Sprinkle the "cheese" over the top of the pizza sauce.
Cover and bake for 30 minutes.