In a pie plate, mix together the nutritional yeast, onion, garlic, turmeric, salt and pepper.
Press the tofu into the mixture on both sides.
Heat a nonstick skillet over medium high heat and add the tofu. Cook on one side for 3 minutes until golden brown, then flip to the other. Repeat with the remaining tofu pieces.
Build the breakfast sandwich by layering the avocado, tomato, onion, tofu, vegan cheese, sprouts and vegan mayonnaise on toasted bread. Top with the other slice. Enjoy!