Sheet pan Greek chicken

Name: Sheet pan Greek chicken
Ingredients: 2 teaspoons onion powder; 2 teaspoons kosher salt; 2 teaspoons dried thyme; 1 teaspoon black pepper; 1/4 teaspoon ground cinnamon; 1/4 teaspoon ground nutmeg; 1/4 cup chopped fresh flat-leaf parsley, divided; 1/4 cup extra-virgin olive oil; 4 (12 oz.) bone-in, skin-on chicken breasts, trimmed; 8 thin lemon slices (from 2 lemons); 1 1/2 pounds Yukon Gold potatoes (halved lengthwise); 1/2 cup Kalamata olives, coarsely chopped; 1/2 cup chopped tomato (from 1 tomato); 2 ounces feta cheese, crumbled (about 1⁄4 cup)