Slice the tofu into pieces ⅛ inch thick and about the width of a slice of bacon.
Heat the oil in a skillet (preferably non-stick), and cook the tofu slices over a medium-low flame until golden brown and crispy on one side. This can take up to 15 minutes, depending on the pan used.
Flip and cook the other side until browned. The tofu should be very brown and crispy.
Sprinkle tofu with the nutritional yeast. Then add the soy sauce and liquid smoke, and stir quickly to coat the tofu slices evenly.