Prepare the vegetables: In a pan over medium heat, add the olive oil and onions. Cook for 5 minutes, stirring occasionally. Add the zucchini and bell pepper, and cook for another 10 minutes until softened.
Prepare the egg-free filling: In a large mixing bowl, add the silken tofu and mash it with a fork. Add the chickpea flour, garlic powder, turmeric, nutritional yeast, mustard, sun-dried tomato, basil, olives, and a pinch of salt and pepper. Mix well to combine. Pour in 3/4 cup of water and stir until smooth.
Prepare the pastry: Lightly spray or brush a tart dish with olive oil. Carefully transfer your rolled dough to the tart dish (I used a 9.5-inch / 24 cm dish) and gently press it into the base and sides. If your dish has sharp edges, flatten the overhanging dough with your fingers to remove the excess, or trim it with a knife. Gently prick the base of the dough with a fork about 8 times.
Assemble: Transfer the cooked vegetables and chickpea mixture onto the prepared dough. Gently stir to combine, making sure the mixture evenly coats all the vegetables. If using, add the red onion slices and tomato toppings by gently pressing them into the surface.
Bake on the middle rack of the oven for 35 minutes. Let it cool slightly before slicing. Enjoy!
Nutritional Information - Per Serving
Calories 568kcal | Carbohydrates 59g | Protein 22g | Fat 23g | Sodium 579mg | Fiber 10g | Vitamin A 74IU | Vitamin C 73mg | Calcium 110mg | Iron 6mg