Beef Puff Casserole

Ingredients

• 1 lb ground beef
• 1 medium onion, chopped
• 12 teaspoon dried thyme, crushed
• 1 egg, beaten
• 14 cup milk
• 34 cup soft breadcrumbs (equvalent of 1 slice of bread, just throw it in the blender to make crumbs)
• 1 teaspoon Worcestershire sauce
• 14 teaspoon salt
• 18 teaspoon pepper
• 3 eggs
• 3 tablespoons milk
• 6 ounces cream cheese, cut up
• 4 ounces cheddar cheese, cubed