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Pre-heat the oven to 350 degrees F.
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In a bowl, mix the dry ingredients-flour, cocoa, baking powder and salt.
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In a separate mixing bowl, whip up the eggs and sugar.
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Add to the mix the butter and vanilla.
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While this is being done, dry saute the chopped spinach in a pan.
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When the spinach shrinks, remove the leaves from the pan and begin to puree with 2 tbsps of water. Add more water if you see the blend needs a little liquid to puree 100%.
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Add the spinach puree to the wet mix and blend well.
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Once blended, gradually add the dry mix.
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Finally fold in the walnuts (and chocolate chips, if being added)
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Now pour the prepared brownie batter into 13 x 9 x 2 inch greased baking pan.
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Bake the mix for 25-30 minutes or till your toothpick comes out dry when you test to see if the brownies have baked to perfection!