In a small bowl, mash feta with the back of a fork until smooth. Stir in yogurt and season with salt and pepper. Set aside.
In small heatproof bowl, combine bulgur and 1/2 cup boiling water. Cover with plastic wrap and let sit 10 minutes. Meanwhile, in a food processor, pulse chickpeas until coarsely chopped. Transfer to a large bowl and add beef and mint. Drain bulgur and add to chickpea mixture. With your hands, mix until mixture is evenly combined and holds together when pressed into a ball. Divide into four 1-inch-thick patties and season with salt and pepper.
Lightly coat a large nonstick skillet with cooking spray and heat over medium-high. Add patties and cook until browned and crispy on the outside and cooked through, 8 to 10 minutes, flipping once. Serve on buns with sliced cucumber, tomato, and feta-yogurt sauce.
Unlike most whole grains, you barely need to cook bulgur -- simply cover it with boiling water and let sit for 10 minutes.
Maybe incorporating a tiny bit of canola oil, olive oil, or safflower oil to hold it together. Egg would be strong flavor I would think but you could use that.
This isn't very good. Bland as hell. The burgers fall apart when you cook them. Forget about trying to get them on your bun in one piece. The sauce also needs something. Maybe some lime or lemon. I don't know. Don't make this. It's edible, but barely.
There seems to be something missing from the recipe. I followed it closely but my chickpea burgers crumbled while they were cooking. Next time I would add egg, or something else to help the ingredients adhere.