Preheat the oven to 375°F.
To create tofu-ricotta, drain and mash the tofu in a mixing bowl. Add the lemon juice, salt, garlic powder, Italian seasoning, and nutmeg. Set aside.
If using Gimme Lean ground beef, crumble into a small frying pan with the tablespoon of olive oil. Fry for about 5 minutes, stirring occasionally. Once it starts to turn golden and crispy, remove from heat. If using TVP, soak it in the 2 cups of boiling broth.
Spread a thin layer of marinara sauce on the bottom of a 9 x 13-inch pan.
Prepare the dry noodles by spreading the tofu-ricotta evenly on each piece. Place 1 layer of noodles on the bottom of the pan. Place a layer of spinach leaves on top of the noodles, followed by half of the ground veggie beef or TVP.
Then pour 1 cup of marinara sauce, making sure it is evenly distributed over the whole pan. Repeat with the second half of your ingredients. Top with a final layer of noodles, the last cup of marinara sauce, and the half cup of vegan cheese.
Cover with foil and bake for 35-45 minutes, until the sauce is bubbling. Uncover and bake for an additional 5 minutes. Allow to cool and set for at least 15 minutes before serving.