Add the tofu, nutritional yeast, mustard, salt, and aminos. Blend the ingredients until they are smooth. Taste the sauce and add salt and white pepper to taste.
Transfer it to a 12 inch cast iron skillet or casserole dish. Sprinkle the breadcrumb mixture evenly over the top of the casserole. Cook in a 400 ° F oven for 20 minutes or until the mac and cheese is heated through and bubbly.