INGREDIENTS
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1/4 cup olive oil, divided
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1- 1/2 pounds beef sirloin, thinly sliced
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1 teaspoon kosher salt
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1 teaspoon black pepper
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1 teaspoon onion powder
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4 tablespoons all-purpose flour, divided
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2 onions, quartered and thinly sliced
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10 ounces mushrooms, sliced
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2 cloves garlic, minced
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1 teaspoon thyme, dried
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4 cups beef stock, hot
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4 sourdough bread bowls, centers hollowed and reserved for dipping
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4 slices smoked provolone