"For smaller appetites, form the bean mixture into six patties. The patties can be prepared through step 1 a day ahead, placed on a parchment-lined baking sheet, covered, and kept in the refrigerator...."
INGREDIENTS
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2 cans (15.5 ounces each) red kidney beans, rinsed and drained
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1 medium carrot, peeled and shredded (about 1/2 cup)
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1 teaspoon chili powder
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1 teaspoon dried oregano
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3/4 cup dried breadcrumbs
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2 large eggs, lightly beaten
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Coarse salt and freshly ground pepper
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3 tablespoons extra-virgin olive oil
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Hamburger buns, romaine-lettuce leaves, sliced avocado, sliced red onion, sour cream, and lime wedges, for serving