Heat the oil in a large skillet over medium heat. Add the onion, garlic and sweet potato. Cook for 8 minutes, stirring occasionally, until the sweet potato is softened.
Add the bell pepper, zucchini and salt. Cook, stirring occasionally, until pepper is softened.
Add curry powder and cayenne pepper. Stir for 1 minute to cook the curry powder.
Add spinach, mint and lemon juice; stir until the spinach is just wilted and mixture is combined. Let the mixture cool.
Place a tortilla in a skillet over medium heat. Divide the curry veggie mixture into thirds. Spread ⅓ on the tortilla in the pan. Sprinkle with ⅓ of the cheese.
Lay a tortilla over the cheese and press down lightly. Cook for 3 to 5 minutes per side until golden brown. Repeat with remaining filling, cheese and tortillas. Cut into 6 or 8 wedges to serve.
Serve with yogurt, mango chutney, lemon wedges and mint leaves.