In a large skillet over medium heat, melt butter. Chop the celery and onions into small pieces and add them to the melted butter.
Cook for 5 minutes until the onions and celery are soft. Add the Stovetop stuffing and chicken broth to the celery mixture. Turn off the heat and mix the stuffing. Let it sit for 5 minutes.
While the stuffing sits, preheat oven to 375 degrees and spray muffin tin with cooking spray.
Add the stuffing mixture to a large mixing bowl. Crack a large egg to the mixture and mix well. With an ice cream scoop, scoop the stuffing mixture into the prepared muffin tins.
Bake for 20 minutes or until the muffins are crispy and golden brown on the outside. Top with green onions and serve warm.
Notes
Pack the stuffing mixture into the ice cream scoop so the stuffing mixture stays together in the muffin tins.