Mix tomatoes, chili, and garlic in a blender, not bringing to complete homogeneity.
Heat the oil in a pan over medium heat. Add onions and oregano, fry for 2 minutes. Add cauliflower, potatoes and prepared tomato sauce, salt, and pepper to taste.
Cover, let simmer for 10 minutes. Remove the lid, let it simmer for another 5 minutes until the cauliflower and potatoes are soft. Add the cilantro.
Spread the mixture over the tortillas, place the rice on top and sprinkle with cheese. Fold the tortillas, leaving one end open.