Preheat the broiler.
In a medium heat-proof bowl, cover the cashews in boiling water and set aside to soak for 15 minutes.
Bring a large pot of heavy salted water to boil and cook the gluten-free pasta until a minute shy of the packaged directions. Drain thoroughly.
Meanwhile, heat 2 tablespoons of olive oil in a large oven-proof skillet. Sauté the onion and garlic over medium heat until soft, about 5 minutes. Transfer to the bowl of a blender.
Add the kale to the pan and sauté over medium heat until wilted, about 2 minutes. Season with 1/4 teaspoon salt and toss together with the cooked pasta. Set the skillet aside.
To the blender bowl containing the onion mixture, add the pumpkin puree, lactose-free milk, nutritional yeast, smoked paprika, miso, lemon juice and 1/2 teaspoon salt. Drain the cashews and add them to the blender. Puree the dairy-free "cheese" mixture until very smooth and the consistency of a velvety soup.
In a small mixing bowl, combine the breadcrumbs with 1 tablespoon of olive oil, if using.
Pour the lactose-free pumpkin sauce over the gluten-free pasta and stir until it coats every noodles. Spread in an even layer and sprinkle with the breadcrumbs, if using.
Transfer the skillet to the broiler and brown for 5 minutes, or until the topping is golden brown and the sauce is bubbling. Enjoy hot, straight from the pan.