Rinse off mushrooms. Then, chop mushrooms and onions.
Melt a tablespoon of butter in large skillet on medium-high heat. Then add sliced mushrooms, onion and garlic. Cook for 5 minutes until golden brown and fragrant, stirring continuously.
In a large bowl, combine broth and corn starch and whisk until thoroughly mixed. Then, add cornstarch slurry and remaining ingredients to skillet with sautéed mushrooms and onions. Reduce stove to medium-low heat and allow to simmer.
Simmer for 10 minutes, stirring occasionally. After 10 minutes of simmering, pour over your steak and enjoy!
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Notes
Nutritional information is an estimate and for informational purposes only.