In a skillet over medium heat, melt butter. Once butter is melted, add the leeks, carrots, and celery. Sauté until soft.
Once softened, add poultry seasoning, salt, and pepper. Stir to combine.
Add the dried and soft bread pieces to the mixture. Stir to combine.
Add the vegetable broth to the mixture to moisten. Taste at this point to see if it needs more seasoning. If so, add more poultry seasoning, salt, and pepper.
Spoon mixture into an oiled 9x13 baking dish. Bake at 350 degrees F for 30 minutes. Enjoy!