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Preheat oven to 375° degrees F.
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In medium bowl stir together flour, baking powder, baking soda and salt.
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In large bowl beat butter until light and fluffy. Slowly add brown sugar and then beat additional 2 minutes. Beat in banana, eggs and vanilla, just until combined.
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Stir in flour mixture.
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Stir in oats, nuts (if desired-I excluded them) and chocolate chunks.
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Drop by heaping teaspoonfuls onto ungreased baking sheet. (I like to line my baking sheet with parchment paper or silicone baking mats.)
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Bake 8 to 10 minutes or until lightly browned. Cool for one minute before moving to wire rack to cool completely.