For the sauce: In a small bowl, whisk together the yogurt, mayonnaise, zaatar and salt. Set aside.
For the chicken: In a medium bowl, whisk together the lemon zest, lemon juice, honey, olive oil, salt and coriander seeds. Slice the chicken breasts lengthwise into 1/3-inch strips; add to the bowl and toss to coat. Let sit at room temperature for about 15 minutes to marinate.
Preheat a grill pan over medium heat. Thread the chicken strips onto 8-inch skewers. Grill for about 4 minutes per side, until the chicken is cooked through and golden brown. Remove to a platter. Serve warm with the dipping sauce.