Preheat the oven to 375°F (190°C) and line a baking sheet with parchment paper.
Sauté onions and celery in melted butter over medium heat until soft, then add salt, poultry seasoning, and black pepper.
Whisk eggs and chicken broth in a separate bowl until well combined.
Combine cubed bread, sautéed vegetables, and parsley in a large bowl, then pour in the egg mixture and toss until evenly coated.
Shape into small balls (about 1.5 inches in diameter) and place them on the baking sheet.
Bake for 20-25 minutes until golden brown and crispy on the outside.
Let cool for a few minutes before serving warm.