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Heat oven to 375º.
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Spray 18 muffin cups with cooking spray.
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Peel bananas and place in a pie plate. Mash them with a fork and set aside.
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Place butter in a large bowl. Add brown sugar.
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Beat with a wooden spoon until well mixed.
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Add eggs to brown sugar mixture.
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Add milk and vanilla.
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Add bananas and mix well.
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Add flour, baking powder, baking soda, and salt to banana mixture.
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Stir with wooden spoon just until all dry ingredients are moistened.
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Stir in the chocolate chips.
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Spoon batter into muffin cups, until each cup is a little more than half full.
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Bake muffins for 15-25 minutes, depending on your oven. They're done when a toothpick inserted into the center comes out clean.
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Place pans on wire racks and let the muffins cool for 3 minutes.
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Remove muffins from pans. (I usually cool them on a wire rack.)