Arrange bread cubes on rimmed baking sheets, making sure they are in an even layer.
Bake for 20 minutes, stirring halfway through.
While the bread is baking, melt the butter in a large skillet over medium-high heat.
Add the celery, onion and 1/2 teaspoon poultry seasoning to the melted butter and saute until softened, about 7-10 minutes; Set aside.
In a large bowl, add the broth and egg and whisk to combine.
Add the toasted bread, sauteed vegetables, remaining poultry seasoning, dried sage and All Purpose Seasoning Blend to the bowl and stir until completely combined and the bread has soaked up all of the liquid.
Transfer to a 13x9 baking dish and bake at 350 degrees F for 20 minutes or until the top of the stuffing is golden brown.