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1
Preheat oven to 375 degrees (F).
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2
Add 1 packet of dry onion soup mix to about 2 pounds of hamburger meat.
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3
Add fresh black pepper, seasoned salt and 2 tablespoons Worcestershire sauce.
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4
Add milk, breadcrumbs and eggs.
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5
Mix all ingredients until well combined.
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6
(Do not overmix or it will toughen the end result).
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7
Portion out meat and pat into six even-sized patties.
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8
Heat 1/4 cup of olive oil with 2 tablespoons of butter until the butter is melted and has stopped foaming; add patties and brown.
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9
Flip patties and brown evenly on both sides.
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10
Place browned patties in a greased 9x13 baking dish; set aside.
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11
Next add the mushrooms and saute until golden (add more olive oil as necessary).
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12
Remove mushrooms from pan and pour over meat patties; set aside.
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13
Saute onions until deep golden brown; add garlic and saute until fragrant.
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14
Spread over mushroom and meat patties; set aside.
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15
Add remaining butter and flour to the pan and cook over medium heat, stirring constantly for about 1 minute.
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16
Whisk in beef broth and the remaining 1 tablespoon Worcestershire sauce and continue cooking while stirring for an additional 2 minutes and free of any lumps.
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17
Pour gravy over meat, onion and mushrooms and cover baking dish with foil.
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18
Bake at 375 degrees (F) for 45 minutes.
