Preheat oven to 375 degrees F. For best results, use paper baking cups in a 12-cup muffin tin.
Wash and dry all produce.
Cook sausage in a frying pan over medium-high heat, breaking into small crumbles, until no longer pink, 5 to 7 minutes. Drain the sausage, reserving the fat. Place sausage into a large mixing bowl.
Pour olive oil into the pan with the sausage fat. Add onion and saute for 2 to 3 minutes. Add celery and apple and cook for about 4 minutes, or until soft and translucent, scraping the bottom of the pan to release any crispy bits of food. Stir in the seasonings and sausage crumbles; stir for about 1 minute. Remove from heat.
In a small bowl, mix broth and eggs together with a whisk until blended.
Add the stuffing, egg mixture, and onion-sausage mixture back into the large bowl. Mix well, taking care not to overwork the cornbread stuffing.
Spoon stuffing mixture into the muffin cups. Gently press the stuffing into the cups and form rounded tops. A large ice cream scoop works great to pack the stuffing into the cups.
Bake 20 to 24 minutes, or until golden brown and cooked throughout. Remove from muffin tin and place on a cooling rack for a couple of minutes before serving. You can remove the paper liner prior to serving if desired.