Orange Cake (Bolo de Laranja)

Bahan-bahan (12 porsi)

• nonstick baking spray with flour
• 4 to 5 large naval oranges
• 3½ cups all-purpose flour
• 1½ teaspoons baking powder
• 1¾ teaspoons kosher salt
• 5 large eggs
• 3 cups granulated white sugar
• 1½ cups mild extra-virgin olive oil
• powdered sugar, (for sprinkling)