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Preheat the oven to 350 degrees and prepare a 9x13 baking dish with nonstick spray.
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In a large bowl, pour in the packets of the cake mix and the pudding.
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Add in the water, vegetable oil, eggs, and coffee or espresso. Mix everything well with a large spoon or with an electrical mixer.
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When everything is well combined, fold in the chocolate chips.
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Pour into the baking dish and bake for 50 minutes – 1 hour.
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While the cake is baking, make the frosting: in a stand mixer, whip the heavy whipping cream on the highest speed with the whisk attachment (make sure the cream is cold or it will not whip).
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On low, add in the coffee or vanilla extract, confectioners sugar, and cocoa powder. You can adjust the amounts of each to your liking.
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The cake will be done when a fork comes out of the center of the cake mostly clean. Let it cool completely before frosting.
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Keep leftovers refrigerated.