Place mushrooms & onions in the bottom of your slow cooker.
Combine beef patty ingredients and form 6 patties. Brown over medium high heat (about 3 minutes per side).
Layer beef patties over mushrooms. Combine remaining ingredients except water and cornstarch. Pour over beef and cook on low 5 hours.
Once cooked, remove patties and set aside.
Turn slow cooker onto high. Combine cold water and cornstarch. Stir into the broth and let cook a few minutes until thickened. Add beef back into the sauce to coat.
Serve over mashed potatoes or rice.
Source:
spendwithpennies.com