Cook broccoli florets with chopped onion in water in a covered skillet until very tender.
Drain off water and place the onions and broccoli florets in a large bowl. Add in the nutritional yeast flakes, Mexican seasoning, garlic powder, salsa, crumbled tofu. Mix well, taste the filling and add salt if needed.
Preheat oven to 350 degrees F.
Add 1/4 cup of the Creamy Salsa Verde Enchilada Sauce to the bottom of a 13x9 glass baking dish and spread evenly over the whole bottom. On a wooden board or other clean working surface, place a tortilla, fill with 1/8 of the filling, roll, and place in the bottom of the 13x9 glass baking dish. Repeat until all 8 tortillas are filled and rolled up.
Pour the rest of the Creamy Salsa Verde Enchilada Sauce over the entire casserole. Cover with foil and bake for 30 minutes or until heated through.
Serve warm topped with chopped avocado and green onions if desired.