Lightly spray a 9x13 baking pan with cooking spray.
In a large mixing bowl, or bowl of a stand mixer, cream the butter and sugar together. Beat in the egg and vanilla. Then add the banana and mix well.
In a separate bowl whisk the dry ingredients together and add them to the wet, mixing just until completely combined. Stir in most of the chocolate chips, reserving some to sprinkle over the top.
Spread out the batter evenly in the pan. Sprinkle the remaining chips across the surface and press them in lightly.
Bake for about 30-35 minutes, until it is slightly puffed, and is not wet or wobbly in the center. A toothpick will have moist crumbs, but not wet batter, clinging to it. If the top seems to be browning too quickly, cover loosely with foil.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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