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Preheat oven to 350 degrees F. Place cupcake liners in muffin tray and spray inside of liners with cooking spray.
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In small mixing bowl, combine oil, yogurt, vanilla extract and eggs.
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In separate bowl, combine flour, cocoa powder, sugar, baking soda, baking powder and salt.
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Add wet ingredients to dry ingredients and gently mix. Do not overmix. (Note: The batter will not be runny. It will be moist and thick.)
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Add grated zucchini and mix.
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Add about 1/4 cup chocolate chips and stir in.
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Pour batter in each of the molds till it is 3/4th full. Sprinkle remaining chocolate chips on top.
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Bake 25 minutes until a toothpick inserted in the center comes out clean.
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Remove muffins from oven and let them cool about 10 minutes before serving.