• Preheat grill to medium-high heat.
• Using a medium skillet, add the olive oil and place over medium heat. Saute the minced onion and garlic for 4-5 minutes, or until soft.
• Meanwhile, using a couple of paper towels, gently squeeze as much liquid from chickpeas as possible. Transfer chickpeas into food processor. Add the sautéed onions and garlic along with the remaining ingredients to food processor (lemon juice, parsley, cilantro, oats (or flour), egg white, bread crumbs, cumin, coriander, chili powder and salt).
• Process until mixture is smooth, but still slightly chunky.
• Shape mixture into 4 patties.
• Brush grill lightly with canola oil.
• Grill burgers for 7-9 minutes, flipping once half-way through.
• Once grilled, assemble burgers with Tzatziki Sauce (see instructions below) and other optional toppings from above.

For the Tzatziki Sauce

• Slice the cucumber lengthwise and use a spoon to scrape out any seeds. Using a medium grater, grate the cucumber into a bowl. Using several paper towels, press the grated cucumber firmly to remove as much liquid as possible.
• Add all of the ingredients (yogurt, sour cream, garlic, lemon juice, vinegar, dill, salt and pepper) and mix until well blended.