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In a food processor, add 1 1/2 cans of beans (reserving 1/2 can until later), tortilla chips, rice, onion, salsa, cumin, and garlic.
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Turn food processor on and combine well until a thick puree has formed.
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Add remaining 1/2 can of black beans to food processor and pulse 2-3 times, just until combined. These should still be chunky.
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With a little olive oil on your hands, shape mixture into 6 patties.
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Brush both sides of patties with olive oil.
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Cook on a grill 3-4 minutes on each side (or in a skillet over medium heat).
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Add desired optional toppings to burger and enjoy!