Preheat your oven to 350°F (175°C) and prepare two 9-inch round cake pans by greasing them with butter or cooking spray, then lightly dust with flour.

In a large mixing bowl, sift together the all-purpose flour, granulated sugar, unsweetened cocoa powder, baking powder, baking soda, and salt. Whisk until well combined.

In a separate bowl, whisk together the large eggs, whole milk, vegetable oil, and vanilla extract until fully blended.

Gradually pour the wet mixture into the bowl of dry ingredients while mixing on medium speed until just combined.

Carefully add the boiling water to the batter, mixing until everything is combined smoothly. Fold in the orange zest, orange juice, and chocolate chips.

Evenly divide the batter between the prepared cake pans and bake for 30 to 35 minutes.

Cool the cakes in the pans for 10 minutes, then transfer to wire racks to cool completely.

Prepare chocolate ganache and spread a layer between the two cake layers, then cover the top and sides.