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TO MAKE THE CAKE: Preheat the oven to 350^F.
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Generously coat a Bundt pan with nonstick spray.
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In a medium bowl, whisk together the flour, sugar, cocoa, baking powder, orange peel, baking soda, cinnamon, and salt.
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Set aside.
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In a large bowl, using an electric mixer set on high speed, beat the eggsand egg whites for 2 minutes, or until frothy and thickened.
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Add the buttermilk, applesauce, and vanilla extract.
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Beat just until blended.
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Gradually beat in half of the flour mixture.
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Beat in the remaining flour mixture.
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Stir in the zucchini and walnuts.
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Scrape into the preapared pan.
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Bake for 45 to 50 minutes, or until a wooden pick inserted in the center comes out clean.
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Cool in the pann on a rack for 15 minutes.
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Loosen the edges of the cake by gently inserting a thin rubber spatula or knife around the sides and center.
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Invert the cake onto the rack to cool completely.
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TO MAKE THE GLAZE: In a small microwaveable cup, combine the chocolate chips and oil.
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Cook in the microwave on high for 30 seconds and stir.
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Repeat just until the chocolate can be stirred into a smooth glaze.
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(The chips will not melt completely in the microwave, but they will get shiny and soft enough to stir until smooth.)
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Drizzle the warm glaze over the cooled cake.