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Preheat the oven to 350 degrees
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In the bowl of an electric mixer, cream the butter and sugar until light and fluffy, about 5 minutes. Add the eggs, one at a time, mixing well between each addition.
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Mix in the orange zest.
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Meanwhile, in a medium bowl sift together flour, baking powder, baking soda, and salt.
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In a small bowl, combine the orange juice, milk, and vanilla.
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Turn the mixer to low and add the flour and milk mixtures alternately in 3 additions beginning and ending with the flour.
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Mix in the greek yogurt.
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Fold in dark chocolate chips.
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Pour batter into a greased and floured bundt pan, and bake for 45 minutes to 1 hour, until golden brown and a toothpick inserted comes out clean.
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Let the cake cool in the pan for 10 minutes.
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Meanwhile, add orange juice to powdered sugar one tablespoon at a time, whisking constantly until mixture is smooth and pourable.
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Turn the cake out onto a wire rack and pour glaze over the whole cake. Allow to cool completely.
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For the chocolate drizzle, melt the dark chocolate candy melts in the microwave according to package instructions. Add heavy cream, one tablespoon at a time, until chocolate drizzles easily over the top of the cake.