Salisbury Steak with Mashed Potatoes and Mushroom Gravy

Ingredients :

1lb.Ground beef¼C.Breadcrumbs1Large egg½Onion chopped fine1tsp.Worcestershire sauceSalt and pepper to taste2Tbsp.Olive oil1Package refrigerated prepare mashed potatoes cooked to the package instructionsFor the gravy:2Tbsp.Butter8oz.Sliced mushrooms2C.Beef broth2Tbsp.FlourSalt and pepper to taste

Préparations :
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