Preheat oven to 400 degrees F. In a medium bowl, combine garbanzo flour and water and stir to combine. Set aside.
In a 12-inch cast iron skillet, heat olive oil. Add yellow onion and cook about 2 minutes, stirring occasionally. Add garlic, red bell pepper, mushrooms, dried basil, dried oregano and salt and cook about 5 minutes, stirring occasionally. Add kale and cook another 5 minutes. Stir in olives and chickpea flour mixture and combine.
Transfer to the oven and cook 30 minutes.
Recipe by Prepgreen at https://www.prepgreen.com/vegan-quiche/