Preheat oven to 350F. Use a little bit of extra olive oil to grease an 8” round cake pan.
In a small saucepan over medium heat, melt the butter. Stir in brown sugar. Once sugar melts, about 3 minutes, scrape the mixture into the bottom of the cake pan.
Grate the zest from one of the oranges and set aside. Slice both oranges crosswise into 1/4-inch-thick rounds and remove any seeds. Arrange the rounds on top of the brown sugar mixture in a single layer.
In a large bowl, sift together the flour, polenta, baking powder, salt and cardamom.
Using a hand mixer or stand mixer, cream together the olive oil, yogurt and sugar until fully blended and smooth, about 3-4 minutes. Slowly beat in eggs, one at a time. Stir in the vanilla and the orange zest.
Fold in the dry mixture using a wooden spoon or spatula. Stir until combined, careful not to over-mix the batter.
Spoon the batter into the cake pan and spread evenly.
Bake for 35-40 minutes, or until a toothpick comes out clean when inserted into the center of the cake.
Let cake cool in the pan for 15 minutes. To remove cake from the pan, run a knife along the edges of the pan to loosen it from the sides. Place a serving plate or cake stand over the cake pan and carefully invert the cake (or flip) in a quick fluid motion.
After allowing to completely cool, sprinkle with confectioners’ sugar and serve.
Filippo Berio’s classic, balanced Extra Virgin Olive Oil. Taken from the first cold pressing of the olives, this oil is ideal for sauces, marinades, drizzling and dipping.