Pulled Chicken Sandwiches

Name: Pulled Chicken Sandwiches
Ingredients: 2 tablespoons dark brown sugar; 1 teaspoon paprika; ¾ teaspoon ground cumin; ½ teaspoon ground chipotle chile pepper; ¼ teaspoon ground ginger; ⅛ teaspoon salt; 2 pounds skinless, boneless chicken thighs; Cooking spray; 2 teaspoons canola oil; ½ cup finely chopped onion; 1 tablespoon dark brown sugar; 1 teaspoon chili powder; ½ teaspoon garlic powder; ½ teaspoon dry mustard; ¼ teaspoon ground allspice; ⅛ teaspoon ground red pepper; 1 cup ketchup; 2 tablespoons cider vinegar; 8 (1 1/2-ounce) hamburger buns, toasted; 16 hamburger dill chips