Dice the onion, tomato, vegan cheese, and vegan sausage. Measure out the remaining ingredients and shake the vegan egg thoroughly.
Add the vegan butter to a medium-high heated sauté pan. Once the butter has melted, add the onion and stir it around until it becomes translucent (3-4 minutes). Next, add the tomato and cook it until it softens (1-2 minutes).
Add the Just Egg to the pan. Let it cook and thicken for about 5-6 minutes as you stir it around. Make sure to scrape the bottom of the pan as you do so.
Once the egg mixture as thickened a little, add the seasoning and vegan cheese to the pan and stir it around for a minute or two as the cheese melts.
Add the vegan sausage to the pan and stir for 2-3 more minutes until it heats through.
Heat the tortillas in a pan or microwave. Add the burrito mixture to them and roll them into burritos.