Mushroom and Shallot Salisbury Steak

Ingredients

• ¾ cup panko breadcrumbs
• 1 Tbsp. plus 2 tsp. Worcestershire sauce
• 5 medium shallots, 2 finely chopped, 3 thinly sliced
• 1 large egg
• 1 lb. ground beef
• 9 garlic cloves, finely grated, divided
• 3 tsp. mustard powder, divided
• 2½ tsp. Diamond Crystal or 1½ tsp. Morton kosher salt, divided, plus more
• 1½ tsp. freshly ground pepper, divided, plus more
• 2 Tbsp. extra-virgin olive oil
• 4 Tbsp. unsalted butter
• 1 lb. crimini mushrooms, thinly sliced
• 3 Tbsp. all-purpose flour
• 3 cups low-sodium chicken broth
• Juice of 1 lemon
• 5 sprigs thyme
• ¼ cup coarsely chopped parsley

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