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In a medium bowl, whisk together flour, baking soda, and salt. Set that bowl aside for a minute.
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In a large mixing bowl, combine butter and sugars, and mix until smooth. Add in the vanilla extract and the egg. Next, add the banana. Beat together well.
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Slowly add in the flour mixture until it’s just combined. Stir in the oats and the chocolate chips.
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Drop the cookie dough by heaping tablespoonfuls about 2 inches apart onto baking sheets. Make sure that your baking sheets have been lined with parchment paper or Silcone baking mats. Bake at 350 degrees F for 15-18 minutes or until golden brown. Remove cookies from pans; cool completely on wire racks.