Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.

In a large mixing bowl, sift all-purpose flour, granulated sugar, cocoa powder, baking powder, baking soda, and salt. Mix thoroughly.

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

Gradually pour the wet mixture into the dry ingredients while mixing on medium speed, then add boiling water.

Stir in orange zest and orange juice into the batter.

Fold in semisweet chocolate chips using a spatula.

Divide the batter evenly between the prepared pans and bake for 30-35 minutes.

Remove from oven and let the cakes cool in the pans for 10 minutes, then transfer to wire racks to cool completely.

Spread ganache between the layers and on top, garnishing with fresh orange slices.