Pork Tenderloin in Creamy Mushroom Sauce

Ingredients

• 2 lb pork tenderloin
• 1 cup flour
• 1 tbsp garlic powder
• 1 tbsp onion powder
• 1 tbsp paprika
• 1 tsp salt
• 1/2 tsp pepper
• 2 tbsp olive oil, divided
• 2 tbsp butter
• 1 1/2 cup onions, sliced
• 1 lb mushrooms, sliced
• 2 cloves garlic, chopped or minced
• 2 tbsp corn starch
• 1/2 cup Marsala or white wine
• 1 cup chicken broth
• 1/2 cup sour cream
• fresh parsley, basil, or chives for garnish