Place all sauce ingredients (plant milk, veggie broth, cashews, soy sauce, spices) into a regular blender and set aside so the cashews can soften. For Vitamix blender, you can blend 30 seconds without soaking the cashews.
Dump the casserole in an ungreased 9 by 13-inch baking dish. Bake uncovered for 40 minutes. For French Fried onion option, bake 35 minutes, then sprinkle with French fried onions and bake 5 more minutes until the top is lightly browned.
Sprinkle with paprika and serve with a green vegetable and salad.