Mediterranean Falafel Burger

Name: Mediterranean Falafel Burger
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: Mediterranean, Asian, Middle Eastern
Ingredients: 1 (14.5oz.) can chickpeas, rinsed and drained; 1 medium onion, finely chopped; 2 garlic cloves, minced; 1/2 cup chopped flat-leaf parsley; 2 Tbsp. all-purpose flour; 2 tsp. chopped fresh cilantro; 2 tsp. ground cumin; 1/2 tsp. salt; 1/4 tsp. crushed red pepper flakes; 1/4 tsp. black pepper; 2 Tbsp. vegetable oil; 4 hamburger buns; ½ cup plain Greek yogurt; ¼ cup shredded cucumber, water squeezed out; 1 clove garlic, minced; 1 tsp. lemon juice; ¼ tsp. salt; ¼ tsp. black pepper; 6 oz. feta cheese, sliced; 8 tomato slices; 4 red onion slices; 4 leaves of lettuce