Preheat your oven to 350°F (175°C).
Grease and line a 9-inch (23cm) round cake pan with parchment paper.
In a large bowl, cream together the softened butter and granulated sugar until the mixture is light and fluffy.
Gradually add the beaten eggs, mixing well after each addition.
Stir in the freshly grated orange zest and orange juice, ensuring the mixture is smooth and well combined.
In a separate bowl, whisk together the all-purpose flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, folding gently until just combined. Be careful not to overmix to maintain a light texture.
Pour the batter into the prepared cake pan, smoothing the top with a spatula.
Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.
In a small bowl, mix the confectioners' sugar with the fresh orange juice until smooth.
Once the cake has cooled completely, drizzle the orange glaze evenly over the top, allowing it to soak in slightly.