1. Preheat the oven to 350°F and grease a 9×13 inch baking dish.
2. Prepare the yellow cake mix according to the instructions on the package.
3. Pour the batter into the prepared baking dish and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
4. While the cake is baking, prepare the custard filling. In a medium saucepan, whisk together the eggs, milk, flour, sugar, and vanilla extract.
5. Cook over medium heat, stirring constantly, until the mixture thickens, about 5-7 minutes.
6. Remove the cake from the oven and use the end of a wooden spoon to poke holes all over the top. Pour the custard filling over the cake, making sure it fills the holes.
7. In a medium saucepan, heat the heavy cream until it starts to boil. Remove from heat and add the chocolate chips, stirring until melted and smooth.
8. Pour the chocolate ganache over the custard filled cake, spreading it evenly to the edges. Let the cake cool to room temperature before serving.
9. Serve with a scoop of ice cream or whipped cream, if desired. Enjoy!
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