Bring a large pot of salted water to a boil. Add the lasagna noodles and cook until al dente, just tender. Drain.
In a medium skillet, drizzle 1/2 tablespoon oil over medium heat. Cook the mushrooms until they begin to soften and darken in color, about 3 minutes.
Stir in the spinach and cook until just wilted. Remove from heat, drain any excess liquid, and allow to cool slightly.
In a medium bowl, combine mushrooms and spinach with Ricotta, Parmesan, egg, nutmeg, salt, and pepper.
Preheat oven to 375˚F and grease 4 (8 ounce each) ramekins with butter or oil.
Place two lasagna noodles crosswise in the bottom of each prepared ramekin.
Top each with 1/4 cup of the vegetable cheese filling. Sprinkle with about 1-2 tablespoons of Mozzarella and a large pinch of Parmesan.
Cover the filling with both sides of one noodle. Cover with another 1/4 cup of the filling, Mozzarella, and Parmesan. Cover with both sides of the other noodle. Spread more filling over the top and sprinkle with Mozzarella and Parmesan.
Bake in preheated oven until cheese is bubbly and golden, 30-40 minutes. Allow to cool for 5 minutes before inverting on a plate and serving with vodka cream sauce.