Combine all food ingredients into large bowl; mix well with clean hands or plastic gloves.
Place meat combination into cooking bag.
Form bagged contents into a loaf and place in casserole dish; tie bag.
Cook for 50 minutes to one hour at 425 degrees.
Carefully cut bag down the center and top with ketchup, cook an additional 10 minutes if needed.
Meatloaf is done when cooked through, do not over cook. The bag will keep the juices and flavors inches Best served with mash potatoes, Velveeta Mac & Cheese shells and biscuit or buttery crescent roll.