Sesame Cauliflower

Name: Sesame Cauliflower
Ingredients: 1 cup rice flour or all-purpose flour; 1/2 teaspoon garlic powder; 1/2 teaspoon onion powder; 1/2 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 1 cup 2 percent milk; 1 head cauliflower, cut into bite-size pieces; Nonstick cooking spray, for the baking sheet; 1/3 cup low-sodium soy sauce; 2 tablespoons honey; 2 tablespoons toasted sesame oil; 2 tablespoons rice wine vinegar or apple cider vinegar; 1 tablespoon cornstarch; 1 tablespoon sesame seeds, plus more for garnish; 2 teaspoons grated fresh ginger; 1 teaspoon sriracha; 3 cloves garlic, minced; Sliced scallions, for garnish