Spicy Stir-Fried Udon Noodles
1 tablespoon garlic powder 1 tablespoon olive oil, or more as needed 1 tablespoon rice vinegar 1 tablespoon sesame oil 1 teaspoon freshly ground black pepper 1 ½ tablespoons Sriracha sauce 2 (7 ounce) packages fresh udon noodles 2 cups chopped broccoli florets 2 tablespoons brown sugar 2 tablespoons diced green onion, or to taste 2 tablespoons hoisin sauce 2 tablespoons oyster sauce 3 boneless pork loin chops, cut into bite-siz… 3 tablespoons bean sprouts, or to taste 3 tablespoons julienned carrot, or to taste 4 cloves garlic, finely chopped, or more to t… ½ cup soy sauce ½ onion, finely chopped