- Combine 1 cup yogurt, turmeric, paprika, and oregano in a bowl. Sprinkle chicken pieces with salt and pepper, add to a large zip-top bag or sealed container with yogurt marinade, toss to coat. Refrigerate at least 1 hour or overnight. 
- To make the skewers, remove chicken from the fridge for 10 minutes. Wipe off excess marinade. Thread onto skewers, adding lemon slices between every few chicken pieces. Cook on a grill pan or grill heated to medium heat, rotating every 5 minutes, until chicken reaches 160 degrees. Allow to sit for five minutes before serving. Top with a sprinkle of salt. 
- Meanwhile, make the yogurt sauce: Mix lemon juice, remaining 1/3 cup yogurt, chili oil and a pinch of salt in a small bowl. Add 1 tsp of water to thin sauce, if needed. 
- Serve chicken on greens or on a platter, drizzle with yogurt sauce, as desired.