Wrap tortillas in foil; heat in 300F 150C oven for about 10 minutes or just until warm.
Meanwhile, in large nonstick skillet, heat oil over medium heat; cook onion, sweet pepper, zucchini, garlic, chili powder and cumin, stirring occasionally, for about 7 minutes or until softened. Add black beans and salsa; cook for about 5 minutes or just until moisture is evaporated. Stir in coriander.
Divide bean mixture among tortillas; sprinkle with lettuce and tomato. Dollop each with yogurt and sprinkle with cheese. Roll up.
Per Serving: about 805 calories, 35 g protein, 19 g fat, 127 g carbohydrate very high source fibre, excellent source calcium and iron