01 - Melt butter in a large skillet over medium heat. Add celery, onion, and carrot; cook until softened, 5–7 minutes. Remove from heat and let cool slightly.
02 - Combine crumbled cornbread, sautéed vegetables, parsley, salt, pepper, sage, thyme, and garlic powder in a large mixing bowl.
03 - Pour broth and beaten eggs over cornbread mixture. Stir until evenly moistened and mixture holds together. Add additional broth by tablespoons if too dry.
04 - Scoop mixture using a 2-tablespoon measure. Roll gently between palms to form 20 balls. Place on baking sheet and refrigerate 20 minutes to firm.
05 - Arrange three shallow bowls: flour in first, 2 beaten eggs in second, panko breadcrumbs in third.
06 - Roll each chilled ball in flour, shaking off excess. Dip in egg, allowing excess to drip off. Press into panko, coating completely and evenly.
07 - Heat 2 inches oil in deep pot or skillet to 350°F. Fry balls in batches of 5–6 for 2–3 minutes until golden brown and crispy. Maintain oil temperature.
08 - Transfer fried balls to paper towel–lined plate. Let drain 1–2 minutes. Serve immediately while hot and crispy.