Preheat the oven to 350 degrees F and line the bottom of a 8-inch spring form cake pan with parchment paper. Note: you can also use a regular cake pan - simply spray with cooking oil.

Combine the wet ingredients (eggs, oil, pure maple syrup, vanilla extract, and orange zest) in a bowl and whisk until well-combined.

Add the remaining dry ingredients (flour, baking soda, sea salt, and cranberries) to a separate bowl and stir. 

Pour the wet ingredients into the bowl with the dry ingredients and stir until well-combined. The batter will be thick! This is normal.

Transfer the cake batter to the prepared cake pan and smooth into an even layer.  Bake on the center rack of the preheated oven for 45 to 50 minutes, or until the cake has set up and the edges turn golden-brown. Turn off the oven and allow the cake to sit in the still warm oven for an additional 5 to 10 minutes.

Remove cake from oven and allow it to cool at least 30 minutes before releasing the mold, slicing, and serving. If desired, sift maple sugar (or powdered sugar or powdered erythritol over the cake) for added sweetness.