Add the walnuts to a food processor, and process until the mixture resembles bread crumbs.
Add in the rest of the ingredients and process until the mixture is homogeneously combined and there are no whole chickpeas remaining, but it still has texture.
Transfer the mixture to a bowl, and taste and adjust flavor. If the mixture is too dry add in a tsp or so of oil, or lime juice, and mix in.
Set the mixture aside, and prepare your nacho cheese sauce, or mozzarella cheese sauce, and set aside
Set up your quesadilla by adding a good layer of the walnut chickpea taco meat, some red bell pepper, pickled jalapeno, and a good drizzle of the cheese sauce.
Place another tortilla on top, and grill it on both sides on a regular skillet, or a grill pan.
Once they're golden brown, slice the quesadillas and serve immediately.
You can serve with some salsa on the side, or some more cheese sauce.
Video
Notes
Nutfree: To make this without walnuts, you can use a mixture of other nuts such as cashews or pecans. To make it nut-free you can use pumpkin seeds.