Preheat oven to 350 °F
In a medium size bowl, whisk together the dry ingredients and set aside.
1½ cups flour, ¾ cups cocoa powder, 1 tsp baking powder, ½ tsp baking soda, ½ tsp cinnamon, ¼ tsp salt
In the bowl of your stand mixer, using the paddle attachment, beat together the eggs and the sugar for 5 minutes at medium speed.
1 cup sugar, 3 eggs, large
To the bowl of your stand mixer add the milk, melted butter and orange zest.
1⅓ cups milk, ½ cup butter, melted, 1 tbsp grated orange zest
Add the dry ingredients to the wet ingredients and mix at medium speed until just combined.
Grease the bottom and sides of your baking pan and pour in the batter. Bake in the middle rack of your oven for 30 minutes, or until a toothpick inserted into the center comes out clean.
oil or butter for greasing the pan
As soon as your cake comes out of the oven, use a skewer to poke holes all over the cake. Pour the syrup over the cake and set aside until the syrup has been entirely soaked into the cake. Allow to cool before serving.