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Preheat the oven to 350 degrees. Generously grease a 14-cavity donut pan with coconut oil. Set pan aside.
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Gently squeeze some of the liquid out of your zucchini—it doesn’t need to be completely dry. Place the zucchini, eggs, egg yolk, honey, coconut oil, lemon juice, and vanilla in a medium mixing bowl and stir until well combined.
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Combine the remaining donut ingredients in another medium mixing bowl and stir to combine. Add the zucchini mixture to the flour mixture and stir until zucchini is just incorporated (don’t over-mix or your donuts will end up oily).
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Divide the batter between the prepared donut cups. Bake 8 to 10 minutes, until a toothpick inserted into the donuts comes out clean.
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Cool in pans for 15 minutes, then invert onto a wire rack to cool before glazing.