Combine stock and half-and-half, and gradually add to saucepan, stirring constantly; bring to a boil.
Remove from heat; stir in 1/4 teaspoon salt and 1/4 teaspoon pepper.
Remove from heat, and stir in chicken, parsley, poppy seeds, Worcestershire sauce, 1/4 teaspoon kosher salt, and 1/4 teaspoon black pepper. Scrape the mixture into an 11 x 7-inch glass or ceramic baking dish.
Combine breadcrumbs, almonds, and melted butter in a bowl, and toss to combine.
Sprinkle breadcrumb mixture over top of casserole, and bake at 350 for 30 minutes.