Preheat oven to 350 degrees. Using a mixer, cream together the butter and sugar until light and fluffy.
Add the egg and vanilla and mis well. When the wet ingredients are thoroughly combined, add flour, oats, baking soda, salt and cinnamon and mix everything together well.
Then add your mushy bananas and your chocolate chips, stirring until just combined.
Drop scoops of dough onto lined cookie sheets or lightly greased cookie sheets.
Make sure there is about 2" between the cookies, as they do spread. Bake at 350 degrees for 12-14 minutes or until they start to brown around the edges.
Cool completely on a wire rack before storing in an airtight container.
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