3 pennsylvania dutch filling Recipes

real butter, light brown sugar , firmly packed, flour (fresh ), whole milk, egg yolks , separate eggs (reserve whites for meringue topping), pure vanilla extract, salt, pie crusts, prepared (baked and cooled ), egg whites (reserved from pie filling recipe), vanilla, cream of tartar, granulated sugar

potatoes, peeled and cut into 1-inch cubes, butter, divided, onions, diced, celery, diced, milk, divided, seasoned salt, divided, white bread , torn into pieces, or as desired - divided