Cover a baking sheet in parchment paper. Spoon about 1 Tablespoon of Nutella onto parchment paper and spread into circle (like shown in photo before).
Freeze Nutella circles until firm (about 3 hours, or overnight).
In a large bowl, whisk together flour, sugar, baking powder and salt.
In a separate bowl, whisk together milk, butter, and eggs.
Add wet mix to dry mix and stir until just combined.
Heat a griddle or large skillet on medium heat (approx. 350 degrees F).
Spray griddle or skillet with nonstick cooking spray.
Spoon batter onto griddle or skillet using a 1/4 cup measuring cup and spread into a circle.
Place frozen Nutella circle onto batter, and top with another 1/4 cup pancake mix.
Spread mix over Nutella and top with banana slices.
Cook pancakes for a few minutes on each side or until golden brown.
Serve with your favorite syrup and enjoy!