Preheat oven to 375 degrees F.
Spray and grease a 9-inch spring-form cake pan with vegetable oil spray.
Place the eggs, milk, honey, butter, vanilla and orange zest in a medium bowl and whisk to combine. Place the cornmeal, flour, baking powder, cinnamon, nutmeg and salt in a second bowl and whisk to combine. Add the dry ingredients to the wet and mix until just combined. Spoon the batter into the cake pan.
Bake the cake for 22-24 minutes, or until the cake springs back when gently touched in the very centre.