A Simple and Hearty Recipe — Beef Stroganoff

Ingredients

• 1.2 lb boneless rib eye
• 2 tbsp vegetable oil , divided
•  1 large onion, sliced
• 10 oz mushrooms, sliced
• 3 tbsp butter
• 2 tbsp flour
•  2 cups beef broth
• 1 tbsp Dijon mustard
• 2/3 cup sour cream
• Salt and pepper, to taste