Braised Oxtails

Name: Braised Oxtails
Ingredients: 4 pounds oxtails, trimmed; 2 tablespoons Miss Brown’s House Seasoning, recipe follows; 1 tablespoon light brown sugar; 1 teaspoon ground allspice; 1/2 teaspoon crushed red pepper flakes; 1/2 teaspoon celery seed; Kosher salt and freshly ground black pepper; 2 tablespoons vegetable oil; 1 yellow onion, halved; 1 green bell pepper, halved and seeded; 1 red bell pepper, halved and seeded; 1 tablespoon fresh thyme, plus more for serving; 2 cloves garlic, minced; One 32-ounce carton beef broth; One 28-ounce can diced tomatoes; 1 cup cola; 1/3 cup ketchup; 2 teaspoons browning sauce; 2 green onions, cut in half; 2 teaspoons garlic powder; 2 teaspoons onion powder; 2 teaspoons sweet paprika; 2 teaspoons kosher salt; 2 teaspoons freshly ground black pepper