Crumble Chedz into crumbs using a food processor or rolling pin.
Whisk eggs, milk, salt, and ground black pepper in a large bowl. Add Chedz crumbs and stir until combined.
Mix ground beef and chopped onions in the Chedz mixture and transfer mixture into a 9x5-inch loaf pan, mini bread loaf pan or slow cooker.
To make the sauce (optional): Combine brown sugar, ketchup, mustard, Worcestershire sauce in a small bowl; spread over meat mixture.
-For 9x5-inch loaf pan: Bake in the preheated oven until no longer pink in the center, 1 to 1 1/4 hours. A thermometer inserted into the center should read at least 160 degrees F (70 degrees C).
-For mini bread loaf pan or regular sized cupcake pan: Bake for ~35 minutes.
-For slow cooker, cook on low for ~5-6 hours.