How to Make It
Preheat oven to 350°F. Grease and flour an 8-inch round baking pan, and line the bottom with parchment paper. In a large bowl, whisk together olive oil, maple syrup, and eggs until smooth. Stir in flour and banana slices.
Scrape batter into prepared pan, and bake in preheated oven until golden brown and a toothpick inserted in center comes out clean, about 45 minutes. Let cool 10 minutes. Unmold cake, and dust with powdered sugar. Serve warm or at room temperature.