Preheat oven to 400 degrees. Grease a shallow 3 quart baking dish. In a large skillet over medium heat, melt butter, then saute celery for 5 minutes. Stir in green onions, and saute an additional 5 minutes. Place in a large bowl and set aside.
Cut hot dogs lengthwise into quarters, then cut into thirds. In the same skillet, saute hot dogs for 5 minutes, until lightly browned. Mix hot dogs into celery and onions. Set aside 1 cup of this mixture.
In a medium bowl, combine eggs, milk, sage, pepper, and corn bread mix. Stir well to combine, then stir into remaining hot dog mixture. Mix in 1 1/2 cups cheese. Spread mixture into prepared baking dish. Top with reserved hot dog mixture and remaining 1/2 cup cheese.
Bake uncovered in preheated oven for 30 minutes, until golden brown.