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1
In a bowl mix together all ingredients for the burgers.
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2
Shape into desired size patties.
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3
Heat 1-2 tablespoons butter in a large heavy skillet over medium-high heat.
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4
Brown the burgers for about 4-5 minutes on each side (the burger will be browned on the outside they do not have to be fully cooked as they will cook more in the gravy; remove to a plate.
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5
Add in onion and saute for about 3 minutes scraping up the browned bits with a wooden spoon while stirring.
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6
Add in fresh garlic and canned mushrooms; cook stirring for 1-2 minutes.
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7
In a medium bowl, mix together cream of mushroom soup, 1/2 package dry onion soup mix, grated Parmesan cheese, Worcestershire sauce and black pepper; mix well to combine then add to the skillet and bring to a simmer over medium heat stirring.
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8
Reduce heat to low and stir in the cream to thin out the gravy (if you prefer a very thick gravy omit the cream).
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9
Place the burgers back then turn to coat with a spoon to coat the burgers with the soup mixture.
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10
Simmer uncovered on low heat for 1 hour or even longer (I have simmered this for 2 hours on low heat, stirring occasionally, turning the burgers over a few time during cooking).
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11
Serve with or over fries or mashed potatoes.