Heat the oil in a large nonstick skillet over medium-high heat. Add the onion and cook for 3 minutes, then add the garlic and scallions and cook 2 minutes longer. Add the tofu and salt, and cook, stirring, for 5 minutes. Stir in the nutritional yeast, cumin, and turmeric. Taste and adjust the seasonings if needed. Stir in the beans, cover, and keep warm.
In a medium bowl, combine the tomato, jalapeno, cilantro, and lime juice. Season with salt to taste and mix well. Gently stir in the avocado.
To assemble, spoon a thin layer of the sauce on the bottom of a large plate. Place half of the chips on top of the sauce. Spoon half of the sauce on top of the chips, followed by half of the tofu and beans, and then half of the salsa. Top with the remaining chips and repeat with the remaining ingredients. Serve immediately, garnished with additional cilantro, if using.
To make the Spicy Queso Sauce:
Combine all the ingredients in a blender and blend until smooth.
Transfer to a saucepan and cook over medium heat, stirring constantly, until thickened, about 5 minutes. Taste and adjust the seasonings, if needed. Use as desired. (See note)