Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan.
In a mixing bowl, cream together the softened butter and sugar until light and fluffy.
Add the eggs one at a time, beating well after each addition.
Stir in the orange juice and zest until fully incorporated.
In a separate bowl, whisk together the flour, baking powder, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
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 comes out clean.
Allow the cake to cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely.
Once cooled, dust with powdered sugar and garnish with orange slices.