"Hamburger Steak Skillet Casserole consists of a hearty ground beef mixture in a thick gravy covered with a layer of white cheddar mashed potatoes...."
INGREDIENTS
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1 tablespoon olive or vegetable oil
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2 pounds lean ground beef
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1 cup chopped yellow onion
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2 (8-ounce) packages cremini mushrooms, (quartered)
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3 garlic cloves, (minced)
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1 teaspoon salt
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1/2 teaspoon black pepper
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1/2 teaspoon dried thyme
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1/4 cup all-purpose flour
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1 (14.5-ounce) can diced tomatoes, (undrained)
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1 (10.5-ounce) can condensed French onion soup
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1 cup beef broth
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1 tablespoon chopped fresh parsley
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1 tablespoon red wine vinegar
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1/4 teaspoon garlic powder
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3 pounds Yukon Gold potatoes
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4 tablespoons butter, (softened)
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1 cup milk, (warmed)
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1 1/2 cups shredded sharp white cheddar cheese
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salt and pepper