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Preheat oven to 325 degrees. See above for blender instructions.
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If using a chia egg, mix together water and chia seed in a small bowl and set aside for a few minutes to gel.
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In a large bowl mix flour, baking soda and salt together.
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In a medium sized bowl mix together sugar and coconut oil until well blended. Add egg, vanilla and mix.
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Place wet ingredients into dry ingredients, and stir until combined. Then mix in chocolate chips.
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Place in an un-greased 10 inch cast iron skillet.
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Bake for approximately 30-35 minutes or until golden brown around the edges.
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The cookie will continue baking in the skillet for a bit, so if you want a softer cookie, after five minutes remove it by placing a cutting board or plate over the skillet and turning it upside down with the help of someone since those skillets are so darn heavy!