Tandoori-Spiced Cauliflower Chicken Flatbreads

Name: Tandoori-Spiced Cauliflower Chicken Flatbreads
Cook time: 40 min
Total time: 40 min
Cuisine: Asian, Indian
Ingredients: 1 small red onion, thinly sliced; 1 1/2 tsp. paprika; 1 1/2 tsp. ground coriander; 1 1/2 tsp. ground cumin; 1 tsp. smoked paprika; 1/4 tsp. cayenne pepper 1 tsp smoked paprika; 1/4 tsp. dry mustard powder; 1/8 tsp. ground cardamom; Kosher salt; 3 tbsp. olive oil; 1 tbsp. tomato paste; 2 cloves garlic, grated; 2 tsp. grated fresh ginger; 1 1/2 lb. cauliflower, trimmed and cut into small florets; 12 oz. boneless, skinless chicken breasts, cut into 2-inch cubes; 1 small yellow onion, cut into 1/2-inch-thick wedges; 1 tbsp. fresh lemon juice; 4 pieces naan or flatbread, warmed; 1/2 c. Greek yogurt or labneh; Cilantro leaves, for serving