Tear the bread into small pieces. Place them in a large bowl. Pour the milk over the bread. Let it sit for five minutes. This makes the meatloaf very soft.
Mix the Meat
Add ground beef to the bowl. Add eggs and Parmesan cheese. Add salt, pepper, and cayenne. Toss in the chopped parsley. Use your hands to mix gently. Do not overmix the meat.
Shape the Loaf
Place a foil strip in the cooker. This helps lift the meat out. Shape the meat into a loaf. Place it inside the slow cooker. Make sure it fits well.
Make the Glaze
Mix ketchup and brown sugar. Add the dry mustard. Stir it until it is smooth. This glaze adds a sweet tang.
Add the Topping
Pour half the glaze on top. Spread it evenly over the meat. Save the rest for later. It adds great flavor.
Slow Cook
Cover the slow cooker with the lid. Cook on low for six hours. You can also use high heat. On high, cook for three hours.
Final Glaze
Add the remaining glaze at the end. Cook for 30 more minutes. This makes the top sticky and delicious.
Rest and Serve
Lift the meatloaf out carefully. Let it rest for ten minutes. This keeps the juices inside. Slice it and enjoy your meal.