Preheat oven to 400°F.
Sauté bacon in a skillet over medium-high heat. Add celery, apple and onion, season with salt and pepper. Let cool.
Make corn muffins from mix to package directions. Add poultry seasoning, nutmeg and parsley. Fold in bacon, celery, apple and onion mixture. Grease muffin tins with softened butter and bake 15 minutes, until golden and cooked through.