To make the Chickpea Patties: Place all ingredients except for the olive oil into a food processor and pulse until just combined, stopping frequently to scrape down the sides. Using the palms of your hands, form the mixture into 6 burger patties.
In a large non-stick skillet, heat some of the oil over medium-high heat. Once hot, carefully add the patties in batches, making sure they don't overcrowd. Add a little more oil with each batch. Allow patties to cook about 4-6 minutes on each side. Once the patties are nicely browned and holding their shape a little better, remove from the heat.
To make the Sweet 'n' Spicy Sauce: In a blender or Magic Bullet, puree all the ingredients together. It should be a nice thick ketchup consistency, but add a tiny bit more water to loosen if needed. Adjust the salt to taste.
To serve: Layer the Chickpea patties, Sweet 'n' Spicy Sauce, sliced avocados and some leafy lettuce or fresh cilantro (if desired) on toasted buns.