How to Make It
Preheat oven to 375°.
Place 4 tablespoons cornmeal in a shallow dish. Combine milk, 2 teaspoons mustard, and egg in a separate shallow dish, stirring with a whisk. Combine pretzels, remaining 1 tablespoon cornmeal, 1/4 teaspoon garlic powder, sugar, 1/8 teaspoon salt, and pepper in a third shallow dish, stirring with a whisk. Lightly dredge chicken in cornmeal, dip in milk mixture, and dredge in pretzel mixture, pressing gently to coat thoroughly. Lightly coat chicken with cooking spray.
Heat a large ovenproof skillet over medium-high heat. Add oil to pan; swirl to coat. Add chicken; cook 3 minutes or until browned. Turn chicken over, and place pan in oven. Bake at 375° for 7 minutes or until done.
While chicken cooks, combine mayonnaise, yogurt, chives, lemon juice, remaining 1 teaspoon mustard, remaining 1/2 teaspoon garlic powder, and remaining 1/8 teaspoon salt in a medium bowl, stirring with a whisk. Serve sauce with tenders.