Place the bread cubes in a bowl and cover with the chicken stock; set aside.
Melt the butter in a large, deep skillet over medium heat. Add the celery, onions and bell peppers; mix well. Add the oregano, poultry seasoning, celery seeds and 1/4 teaspoon salt. Cook, stirring occasionally, until the vegetables are tender, 10 minutes. Add the bread mixture, the Cornish Hen stock and 1/4 teaspoon black pepper; mix well. Heat through for 5 minutes.