Vegan Cauliflower Buffalo Wings

Name: Vegan Cauliflower Buffalo Wings
Ingredients: Cooking spray; 1 ¼ cups unsweetened plain almond milk; 1 cup all-purpose flour; ½ teaspoon cayenne pepper; 2 tablespoons garlic powder, plus 1/2 teaspoon, divided; 2 tablespoons onion powder, plus 1/2 teaspoon, divided; 1 ¼ teaspoons ground pepper, divided; 8 cups cauliflower florets (from 1 medium head); 2 cups panko breadcrumbs; ¼ cup vegan mayonnaise; 2 tablespoons chopped fresh dill; 1 tablespoon cider vinegar; 3 ½ tablespoons Buffalo-style hot sauce (such as Frank's RedHot); ¼ cup celery leaves (Optional)