Preheat the oven to 350 degrees.
Grease a bundt pan.
In a stand mixer mix together sour cream, vegetable oil, apple sauce, eggs, egg yolks, instant coffee, and cocoa powder.
Mix in the gluten-free chocolate cake mix. Scraping the side of the bowl as needed.
Pour the batter into the bundt pan.
Bake for 45-50 minutes until a inserted toothpick comes out clean.
Cool in the pan on a wire rack for 10 minutes.
Turn out onto the wire rack and allow the cake to cool completely.