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Preheat the oven to 350 F. Line an 8x8 inch pan with parchment paper (make sure paper hangs over two sides of the pan) and set aside.
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In a large bowl, whisk together the oats, oat flour, whole wheat flour, baking soda, cinnamon, salt and brown sugar.
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Add the mashed bananas and vanilla and stir well.
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Add the buttermilk and stir to combine.
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Fold in the chocolate chips.
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Pour the batter into the lined pan and smooth it out.
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Bake for 30-35 minutes until a toothpick inserted in the center comes out clean and the squares are golden brown.
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Remove from oven.
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Allow to cool in the pan then lift it out of the pan with the parchment paper handles and slice into squares.
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Store in an airtight container at room temperature for 4-5 days.
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Notes: If you dont have oat flour, you can easily make it by grinding regular oats in a food processor for a couple minutes.
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Just be sure to measure the flour after grinding, not before.
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If you want these to be even healthier, you can omit the chocolate chips, or replace them with raisins.
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My kids loved these with raisins, even though they werent as sweet.
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The buttermilk can be subbed with regular milk if you dont have any.
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Adapted from Chelseas Messy Apron.