Preheat the oven to 350°F. If your bread is not stale, arrange in a single layer on a baking sheet and toast for 15-25 minutes.
Add the onion and celery to a large skillet and cook over medium heat for 5-7 minutes, until soft. Add a splash of vegetable broth if the veggies start to stick.
Add the sausage and cook 2-3 minutes.
Add the bread, parsley, sage, thyme, salt, and pepper to the pan. Toss and allow to toast for 1-2 minutes over the heat.
Turn off the heat and pour on the remaining vegetable broth. Toss well. *If you want you can serve immediately after this step. Baking helps solidify flavor and make it a more sticky stuffing, so I do recommend continuing to step 6.*
Transfer the mixture to a medium sized baking dish. Bake for 30-35 minutes, until the top of the stuffing is golden brown.
Let cool 5 minutes before serving. Garnish with fresh parsley, sage, and/or thyme, if desired.