Halve the eggplant, brush with a little olive oil, and bake at 400°F (200°C) for 25 minutes, or until softened.
Scoop the flesh out of the baked eggplant into a bowl and mash with a fork.
Rinse the chickpeas, then mash with a blender or fork and mix with the eggplant.
Finely chop the onion and garlic, then sauté in a tablespoon of olive oil over medium heat for 5 minutes.
Add the sautéed onion and garlic to the eggplant mixture, then stir in the rolled oats, breadcrumbs, spices, and chopped parsley.
Thoroughly mix the batter, then form 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 a tablespoon of olive oil in a skillet, 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 eggplant 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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