Preheat the oven to 350ºF. Cook pasta according to package instructions.
Meanwhile, prepare the sauce. Drain and rinse the cashews, then place them into a blender. Add the remaining ingredients, except the breadcrumbs, starting with just ⅓ cup of water.
Blend on high until smooth and creamy, adding more water, 1 tablespoon at a time, until the sauce is pourable.
Drain the pasta and pour into an oven-safe baking dish. Pour sauce over top and stir to combine.
Sprinkle breadcrumbs onto the noodles, cover the dish with foil, and bake on the center rack for 20 minutes. Remove and serve immediately.