Sumac Chicken With Yogurty Cucumber Salad

Name: Sumac Chicken With Yogurty Cucumber Salad
Prep time: 1 h 30 min
Cook time: 15 min
Total time: 1 h 45 min
Cuisine: American
Ingredients: 1 cup whole-milk Greek yogurt; 2 teaspoons kosher salt, plus more to taste; 2 teaspoons ground sumac; 2 boneless, skinless chicken breasts (about 1/2 pound each), halved horizontally; 2 tablespoons extra-virgin olive oil, divided; 3/4 red onion, roughly chopped; 4 Persian cucumbers; 1/4 red onion, thinly sliced; 1/4 teaspoon kosher salt; 1 tablespoon extra-virgin olive oil; 3/4 cup whole-milk Greek yogurt; 1 pinch ground sumac