Preheat your oven to 350 degrees F. Lightly grease a medium baking sheet, or line it with foil. In a medium bowl, mix together the cream cheese, cheddar cheese, onion, and spices. Next, stuff jalapeño halves with the mixture. Whisk together the eggs and milk in a small bowl, and place your crushed corn flake cereal in a separate small bowl. Dip each stuffed jalapeño half into the egg and milk mixture before then rolling them in the corn flake cereal to coat each one.