In large bowl, combine 2 cups flour, sugar, undissolved yeast, 2 tablespoons onions, parsley flakes, poultry seasoning and salt. Heat water and butter until very warm (120 to 130°F). Stir into flour mixture. Beat 2 minutes at medium speed of electric mixer, scraping bowl occasionally. Stir in remaining flour to make stiff batter.
Cover; let rest 10 minutes. Turn batter into greased 1-1/2 quart casserole. Smooth top of dough in casserole with floured hands. Cover; let rise in warm, draft-free place until doubled in size, about 30 minutes. Brush beaten egg on loaf. Sprinkle with remaining onions and celery seed.
Bake at 375°F* for 35 minutes or until done. Remove from casserole; cool on wire rack.