Preheat oven to 350˚F.
Lightly spray 9x13 baking dish with cooking oil and set aside.
Cut pork tenderloin into medallions; set aside.
Place lightly beaten egg in a shallow bowl.
In a separate plate combine breadcrumbs, parmesan cheese, and Italian Seasoning.
Heat olive oil in a large skillet set over medium-high heat.
Dip each pork medallion in beaten eggs and then into breadcrumbs.
Add pork medallions to the heated oil and cook for 3 to 4 minutes per side, or until golden brown. It doesn’t need to be cooked through, but you want to brown it nicely on both sides.
Meanwhile, add 1 cup tomato sauce to the bottom of previously prepared baking dish.
Arrange fried pork medallions over the tomato sauce.
Pour remaining tomato sauce over pork medallions.
Top with mozzarella cheese.
Cover with foil and bake for 25 minutes.
Remove cover and continue to bake for 10 more minutes, or until hot and bubbly.
Remove from oven and let stand 5 minutes.
Garnish with parsley and parmesan cheese.