Preheat your oven to 350°F (175°C). Generously grease two 9-inch round cake pans with butter or cooking spray, then dust with flour.

In a large mixing bowl, sift together the dry ingredients: flour, sugar, cocoa powder, baking powder, baking soda, and salt. Whisk until well combined.

In a separate bowl, whisk together eggs, milk, vegetable oil, and vanilla extract until smooth.

Gradually pour the wet ingredients into the dry mixture, mixing on medium speed. Then add boiling water and mix until smooth.

Fold in the orange zest and juice, then add chocolate chips, ensuring even distribution.

Divide the batter between the prepared pans and bake for 30 to 35 minutes, until a toothpick comes out clean.

Cool the cakes in the pans for 10 minutes, then run a knife around the edges and invert onto wire racks to cool completely.

Once cooled, frost with chocolate ganache and garnish with fresh orange slices.