My local Wendy's has them on the menu for $4.69.
The chicken had a very nice crispy crunch to it and was relatively moist inside. It came in at a decent thickness and was long enough to creep out of the bun. The flavor was good as well.
The parmesan sauce was creamy and cheesy, but lacked depth. I was hoping for a bit more flavor from the mozzarella, the two melted slices added texture and creaminess, but that's about it.
Overall, Wendy's Mozzarella Chicken Supreme tasted mostly of chicken and creamy parmesan sauce, which made it just okay and not "supreme" for me.
Nutritional Info - Wendy's Mozzarella Chicken Supreme (286g)
Calories - 650 (from Fat - 260)
Fat - 29g (Saturated Fat - 10g)
Sodium - 1630mg
Carbs - 60g (Sugar - 8g)
Protein - 38g