Season 1 lb chicken tenderloins with salt, pepper, and 2 tablespoons za’atar seasoning.
In a large pan over medium heat, cook chicken in a greased pan for about 5 minutes per side until golden and cooked through. Set chicken aside.
In the same pan, add 1 cup pearl couscous with 1¼ cups hot water and 1 tablespoon butter to the pan and set to medium heat. Stir until butter is melted. Cover and allow to cook for 5 minutes.
Uncover couscous, stir in 1 tablespoon more butter, juice of ½ lemon, and 2–3 big handfuls of spinach. Stir until the spinach is wilted.
Cut chicken into 1 inch pieces and nestle the chicken into couscous and spinach mixture.
Make the sauce: Mix together 3 tablespoon Greek yogurt, ½ tablespoon olive oil, ½ tablespoon lemon juice, and ¼ teaspoon garlic powder and salt to make the sauce.
Fill individual bowls with couscous and chicken mixture and drizzle with lemon yogurt sauce to serve.