Preheat your oven to 350°F (175°C).
In a mixing bowl, cream together the softened butter and sugar.
Add the eggs one at a time, mixing well after each addition.
Stir in the orange juice and zest until combined.
In a separate bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, mixing just until combined.
Pour the batter into a greased and floured cake pan.
Bake for 30–35 minutes, or until a toothpick comes out clean.
Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack.
Once cooled, it can be frosted or dusted with powdered sugar if desired.