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Preheat the oven to 350 degrees F (180C).
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Sift the dry ingredients together.
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Using a mixer, cream the butter with the sugar, add the orange peel, extract, egg yolk and whipping cream. The room temperature ingredients are key so that you can create a smooth, homogeneous mix.
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Stir the dry ingredients into the wet, mixing *just* until it is incorporated.
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Stir in the chocolate chips.
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This is a pretty dry dough, so blend it with a wooden spoon to incorporate the dry bits and break up any concentrations of chocolate chips.
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At this point you can make about 1" balls of cookie dough that you can then press out on a cookies sheet covered with parchment paper. These cookies don't spread much when baking.
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Bake approximately 7-10 minutes rotating the pan during cooking as needed.
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Alternatively, you can take the whole of the cookie dough and roll it into a log, wrap it in plastic wrap, then refrigerate until firm. Next you can slice off about 1/4" cookies. This latter option makes for a more uniform cookie and a smoother appearance.
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Note: if you use a whole egg instead of just the egg yolk, the cookies bubble up a bit and have a lumpy appearance. Still tasty, though.