Crock Pot Beef & Broccoli

1 1/2 pounds boneless round steak (cubed )
1 cup fresh sliced mushrooms
1 small onion (diced)
1/2 cup beef broth
2 tablespoons teriyaki sauce
2 cups broccoli florets
1 tablespoon cornstarch
2 tablespoons water

Combine beef, mushrooms, onion, broth and teriyaki sauce in crock pot. Cover and cook on low for 8 hours. Approximately 45 minutes before serving dissolve cornstarch in 2 tablespoons cold water. Add water/cornstarch mixture and broccoli to crock pot. Cover and cook a further 45 minutes.