Cut squash into wedges. Plac squash wedges and onion into bottom of a 6-quart slow cooker. Place chops on top. In bowl, stir together broth, marmalade, mustard, thyme and pepper. Pour mix over chops. Cover, cook on low for 5-6 hrs. Transfer chops and veggies to a platter, keep warm. Strain juices into a lg measuring cup. Skim off fat. Measure juices and water, If needed, to measure 1-3/4 cup liquid. Pour into saucepan. Stir together cornstarch and cold water. Add to saucepan. Stir to mix over medium heat until thickened. Serve sauce over chops and veggies.