Preheat the oven to 400 degrees F.
Cook shredded potatoes in a pan with water until they soften. Then add diced onion and cook until translucent.
Add the silken tofu, garlic, mustard, turmeric, paprika, salt, nutritional yeast, and cornstarch into a food processor or blender and process until mostly smooth.
Mix into potatoes then spread into a baking dish adding chopped spinach. Top with tomato slices.
Bake for 1 hour and serve hot.
