Place soy crumbles, cheese wedge half, and taco seasoning in a microwave-safe bowl, breaking cheese into pieces as you add it. Microwave for 1 minute. Add taco sauce and mix well. Set aside.
Lay tortilla flat on a microwave-safe plate, and warm it in the microwave for about 10 seconds. Place soy crumble mixture in the center of the tortilla and top with shredded cheese.
Return plate to the microwave, with the tortilla not yet folded, and cook for about 40 seconds, until shredded cheese begins to melt.
Top cheese with sour cream. Wrap the tortilla up by first folding in the sides and then rolling it up from the bottom.
With the seam-side down on the plate, heat in the microwave for 30 seconds. Enjoy!