Heat the oven to 350°F. Heat the oil in a 10-inch skillet over medium-high heat. Add the zucchini and onion and cook for 5 minutes or until they're tender. Stir in the spinach and corn.
Warm the olive oil in a small pan over a medium heat and gently fry the garlic until beginning to colour on the edges. Add the paprika followed by the tomatoes. Season, then add 50ml/2fl oz water ...
Spoon the remaining enchilada sauce over the top and scatter with grated cheese. Bake for about 20 minutes, or until the filling is piping hot and the cheese bubbling, melted and golden-brown.