Dry the beans
Preheat oven to 325°F (163°C). Spread rinsed black beans on a lined baking sheet and bake for 12–15 minutes until slightly dried.
Cook the vegetables
Heat olive oil in a skillet over medium heat. Sauté onion, bell pepper, and garlic for 5–6 minutes until softened. Pat away extra moisture.
Mix the base
In a large bowl, combine roasted beans, sautéed vegetables, spices, breadcrumbs, eggs, ketchup or BBQ sauce, and feta (if using). Lightly mash, leaving some beans whole for texture.
Shape the patties
Form mixture into 6–7 patties, about ¾ inch thick. Chill in the fridge for 20 minutes to firm up.
Cook your way
Bake: 375°F (191°C), 10 minutes per side (20 minutes total).
Grill: Medium-high heat, 8 minutes per side on greased foil or mats.
Pan-Fry: Medium heat, 4–5 minutes per side until browned and crispy.
Serve
Place on toasted buns with your favorite toppings, or serve over salads or bowls.