Ingredients
- 2 (15-oz.) cans black beans, rinsed and drained
- 1/2 medium yellow onion, chopped
- 2 cloves garlic, minced
- 1 large egg
- 1/2 c. plus 2 tbsp. mayonnaise, divided
- 3/4 c. panko bread crumbs
- kosher salt
- Freshly ground black pepper
- 2 tbsp. canola oil
- 4 slices white cheddar
- 3 tbsp. ketchup
- 4 Hamburger buns
- 1 tomato, sliced
- 4 Romaine lettuce leaves
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