Beef Stroganoff Soup -Paula's Recipe - (4.6/5)

Ingredients

• 1/3 cup all-purpose flour
• 1/2 teaspoon salt
• 1/2 teaspoon ground black pepper
• 2 1/2 pounds sirloin tip roast, trimmed and cut into 1-inch pieces
• 1/4 cup butter, divided
• 1 (8-ounce) package sliced baby portobello mushrooms
• 1 large onion, thinly sliced
• 1 tablespoon minced garlic
• 2 (32-ounce) cartons beef broth
• 2 tablespoons Worcestershire sauce
• 10 sprigs fresh thyme
• 8 ounces thin egg noodles
• 1/2 cup sour cream
• 1 tablespoon Dijon mustard