Combine sugar, salt, baking powder, and eggs in a stand mixer or a large bowl with hand beaters. Mix on medium speed for for 1 minute. Scrape the bowl.
1 ¾ cups sugar, ½ teaspoon salt, 1 tablespoon baking powder, 3 eggs
Add in the additional wet ingredients: buttermilk, oil, vanilla, zest, and cinnamon. Mix on low for 1 minute. Scrape the bowl.
1 cup buttermilk, ½ cup oil, 1 teaspoon vanilla, 1 tablespoon orange zest, 1 teaspoon cinnamon
Add in flour. Mix on medium speed for 2 minutes. Scrape one last time.
2 ¼ cups flour
Pour into prepared baking pan. Bake for 50-55 minutes at 350 degrees or until toothpick comes out clean.
Allow the cake to cool for 10 minutes in the pan. Then use a long skewer to poke holes ¾ of the way down the cake. Once holes are evenly distributed around the cake, pour the cooled syrup over the cake evenly. Allow it to finish cooling in the pan.
When the cake is completely cooled, flip it out onto a cooling rack.