Tender Beef in a Creamy Mushroom Sour Cream Sauce

Ingredients

• 2 tablespoons butter
• 1 pound lean beef, cut into strips
• 1 onion, minced
• 2 cloves garlic, minced
• 2 cups sliced mushrooms
• 1 teaspoon Worcestershire sauce
• 1/2 teaspoon dried thyme
• 1/4 teaspoon salt
• 1/4 teaspoon ground black pepper
• 1/2 cup beef broth
• 1/2 cup sour cream