Preheat oven to 350 degrees Fahrenheit. Line an 8x8 glass pan with parchment paper.
In a large bowl, use an electric mixer to beat together the butter and the sugar until fluffy.
Add eggs one at a time, mixing briefly between each addition.
Use a wooden spoon to hand mix in the flour, salt, and baking powder.
Spread a little less than half of the mixture in the pan on the parchment paper.
Spread bananas slices over the dough.
Spread chopped dates over the bananas.
Spread the other half of the dough over the bananas and dates, using your fingers to make sure it covers the entire surface. You may need to (very lightlwet your fingers with water to keep the dough from sticking to them.
Bake in the oven for about 30-35 minutes.
In a small bowl, mix together the cinnamon and sugar.
When the dessert comes out of the oven, brush the top with 2 tbsp melted butter and sprinkle with cinnamon sugar.
Wait for the bars to cool, then cut them into 9-12 squares and enjoy!
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