Preheat the oven to 350 degrees and spray a 9x13 baking dish with non stick cooking spray.
Heat olive oil in a large skillet on medium high heat and add the pork sausage. Cook until browned breaking it up as you go. Remove to a large bowl and set aside.
Add the butter, onion, celery and carrots and cook until soft about 4-5 minutes. Add in the garlic and cook another 30 seconds until fragrant. add them to the bowl with sausage.
Add the boxed stuffing to the bowl along with the chicken broth and mix until everything is combined.
Add the stuffing mixture to the prepared baking dish and press lightly.
Bake uncovered for 20-25 minutes.
Notes
I use savory herbs, but any flavor stuffing would be fine.
If you would like a wetter stuffing, add another 1/2 cup of broth.
Refrigerate leftovers in an airtight container for 3-4 days.
Stuffing can be assembled the night before. You may want to add a 1/2 cup of chicken stock right before baking if it seems to dry.