Peel and chop the sweet potato into smaller pieces. Boil in salted water for about 10 minutes until tender, or bake at 400°F (200°C) for 25 minutes.
Place the boiled or baked sweet potato in a bowl and mash with a fork until smooth.
Rinse the chickpeas, then mash with an immersion blender or a fork. Add to the sweet potato.
Finely chop the onion and garlic. Sauté in one tablespoon of olive oil over medium heat for 5 minutes.
Add the sautéed onion and garlic to the sweet potato mixture, then stir in the rolled oats, breadcrumbs, spices, and chopped parsley.
Mix the mixture thoroughly, then shape it into 4 equal-sized patties. If it's too soft, add a little extra breadcrumbs.
Place the patties on a tray and let them rest in the refrigerator for 30 minutes to firm up.
Heat one tablespoon of olive oil in a frying pan and cook the patties over medium heat for 4-5 minutes per side, until golden brown.
Toast the hamburger buns in a dry skillet or oven.
Assemble the burger: place a lettuce leaf on the bottom half of the toasted bun, top with the sweet potato patty, a slice of tomato, then mustard and ketchup.
Place the top of the bun on top and serve immediately with a fresh salad or fries.
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