Preheat the oven to 350 degrees. Spray a loaf pan with cooking spray and set aside.

n a large bowl cream together the butter and sugar. 

Add in the eggs and mix well. 

In a medium bowl combine the flour, baking powder, and
salt.  Mix well.

Add half of the flour mixture to the butter mixture and mix well.

Stir in the sour cream and vanilla extract.  Add in the orange juice and orange zest and mix well.

Add remaining flour and mix until just combined.

Pour into prepared loaf pan

Bake for 45-55 minutes or until a toothpick inserted into the center comes out clean.

Cool for 10 minutes then run a butter knife around the edges of the pan and turn onto a wire rack. Cool completely.

To make the glaze whisk together the powdered sugar and orange juice until well combined. Drizzle over top of the cake. Top with sliced oranges if desired.