Preheat your oven to 350°F (175°C) and grease a round or oval cake pan with butter or cooking spray.

Whisk together all-purpose flour, granulated sugar, baking powder, and salt in a large mixing bowl until well combined.

Cream softened unsalted butter and granulated sugar in another bowl until fluffy and pale. Add in eggs one at a time, mixing well after each addition.

Stir in the zest and juice of fresh oranges until fully incorporated.

Fold in the dry ingredients gently until just combined; pour the batter into your prepared pan.

Bake for 40-45 minutes, or until a toothpick inserted in the center comes out clean. Cool for 10 minutes before transferring to a wire rack.

Mix powdered sugar with a splash of orange juice until smooth and drizzle over the cooled cake.