Combine first 8 ingredients in a medium bowl and stir well. Shape mixture into an 8 x 4 inch loaf. Place on a rack in a roasting pan coated with cooking spray. Bake at 350 degrees for 1 hour. Transfer meatloaf to a serving platter and keep warm. Combine bouillon granules, flour, and water in a small saucepan. Stir well. Cook over medium heat until thickened, stirring constantly. Combine sour cream, green onions, and white pepper. Add to bouillon mixture, stirring well. Cook over low heat until thoroughly heated, stirring constantly. DO NOT BOIL!! Spoon evenly over meatloaf. Serve warm.