Bring a large pot of salted water to a boil and cook the pasta until just al dente, about 8-10 minutes. Drain and set aside, reserving ½ cup of pasta water.
In a skillet over medium heat, add a tablespoon of olive oil. Sauté the chopped mushrooms with smoked paprika until they are browned and fragrant, about 5 minutes. Remove from heat and set aside.
In a blender, combine the soaked cashew nuts, nutritional yeast, lemon juice, mushroom broth, minced garlic, black salt, and a pinch of smoked paprika. Blend until silky smooth, adding reserved pasta water a tablespoon at a time to achieve a creamy, flowing sauce.
Pour the blended sauce into the skillet with the sautéed mushrooms. Warm over low heat, stirring gently, until the sauce thickens slightly and becomes glossy, about 2 minutes. Adjust seasoning if needed.
Add the cooked pasta to the skillet, tossing gently to coat each strand evenly with the creamy sauce. Cook for another minute to allow flavors to meld.
Remove from heat, drizzle with a little more olive oil for shine, and sprinkle with chopped parsley. Serve immediately while hot, enjoying the silky, smoky, plant-based goodness.