Cut french bread into 1 inch pieces, lay out on a baking sheet or wire rack, cover with a clean kitchen towel and allow to dry out for 24 hours.
Preheat oven to 375 degrees.
Melt butter in a pan over medium heat. Add onion and celery to the pan and sauté for 5-7 minutes, or until veggies become slightly tender.
While veggies are cooking, combine bouillon and water in a measuring cup and stir until bouillon dissolves. Add broth, parsley, rosemary, salt & pepper to the pan and stir to combine. Taste and adjust seasoning as needed.
Place bread pieces in a baking dish.
Ladle broth mixture over the bread 1/2 cup at a time, stirring as you go until the stuffing has your desired amount of moisture.
Cover with foil and bake for 20 minutes. Remove foil and bake for an additional 10 minutes, or until top is browned and slightly crisp.
Serve and enjoy!