Place the raw cashews or macadamia nuts in a bowl, cover them with water, and let soak for 6-8 hours to soften. After soaking, drain the nuts thoroughly and pat dry.

In a food processor or high-speed blender, combine the soaked nuts, red bell pepper, 1/2 cup water, nutritional yeast or Parmesan cheese, salt, onion powder, ground turmeric, and optional nutmeg. Blend until the mixture is completely smooth and creamy.

In a separate pot, bring salted water to a boil and cook the pasta according to the package instructions. Once cooked, drain the pasta fully but do not rinse it.

Transfer the blended sauce to a pot and heat over medium heat until it reaches your desired serving temperature, stirring occasionally.

Pour the warm Alfredo sauce over the drained pasta. Stir in any optional cooked vegetables, beans, or other add-ins if desired. Adjust seasoning with additional salt and pepper to taste. Serve immediately while hot.