Preheat oven to 350* F. Grease an 8-inch round cake pan with non-dairy butter and insert a parchment circle into the bottom of the pan to ensure the cake doesn't stick.
In a medium bowl, combine flour, baking powder and salt. Whisk to combine and set aside.
1 ¾ Cup All-Purpose Flour, 2 teaspoon Baking Powder, ¼ teaspoon Kosher Salt
In a large bowl, combine sugar, non-dairy milk, melted non-dairy butter, orange juice, vanilla extract and orange zest. Whisk well to combine. Then, add the dry ingredients to the wet ingredients and whisk to form the batter.
1 Cup Granulated Sugar, ½ Cup Non-Dairy Milk, 7 tablespoon Non-Dairy Butter, melted, ¼ Cup Orange Juice, 1 teaspoon Orange Zest, 2 teaspoon Vanilla Extract
Place the candied orange slices into the bottom of the prepared cake pan, starting in the center of the pan, and slightly overlapping each orange slice. I used 14 slices of orange, but you may need more or less depending on the size of your oranges.
Pour the cake batter on top of the orange slices and use a spatula to evenly spread it out. Bake the cake in a 350* F oven for 38-43 minutes or until a toothpick inserted into the center of the cake comes out clean.
Allow the cake to cool for 15 minutes. Then, run a paring knife around the outside of the cake and gently flip it onto a wire cooling rack to cool completely. Serve.