Pork Loin with Creamy Mustard Sauce - Yummy Expert

Ingredients

• Pork loin pieces (or chicken or beef as an alternative)
• Salt and pepper, to taste
• 3 tbsp oil
• 1 tbsp butter
• 1 onion (finely chopped)
• 1 green onion, finely chopped
• 1/2 glass of wine (white or red, depending on preference)
• Sour cream, to taste (for the sauce)
• Cheese (optional, grated, such as Parmesan or any preferred cheese)
• 1 tbsp mustard
• Fresh parsley, chopped (for garnish)
• Aluminum foil (to keep meat warm)