2 to 2 1/2 pound Pork Tenderloin 1/2 Cup Flour 1 Tbsp. Garlic powder 1 Tbsp. Onion powder 1 Tbsp. Paprika 2 Tbsp. Butter 2 Tbsp. Olive oil 1 large Onion, sliced 1 pound Portabella Mushrooms (or any type), sliced 2 Garlic cloves, chopped 2 Tbsp. Flour or Corn Starch 1/2 Cup Marsala or White…