Banana Nutella Bars

Preheat oven to 350 degree fahrenheit. Grease and line an 8x8-inch pan with parchment paper. Set aside.

In a bowl, sift together flour and baking powder. Set aside.

In the bowl of an electric mixer fitted with the paddle attachment, cream together butter and sugars until light and fluffy, about 5 minutes. Add eggs one at a time, making sure that each egg is incorporated before adding the next.  Scrape the bottom and sides of the bowl occasionally. Add banana extract.

Add flour mixture and mix until no dry streaks remain. Add bananas and chocolate-hazelnut spread; mix just until combined. Do not overmix.

Pour batter into the prepared pan. Bake for 30 to 45 minutes or until edges start to shrink away from the pan. Set aside to cool completely before cutting into squares. Spread chocolate-hazelnut spread on top and sprinkle with chopped hazelnuts, if desired.