Preheat oven to 350 degrees F.
Spray 2 loaf pans with Bakers Joy or grease and flour.
In a large bowl cream together butter and sugar for about 2 minutes.
Add ricotta and blend again for another minute.
Add eggs one at a time beating for 1 minute after each addition.
Add vanilla and orange zest and mix again.
Add baking powder, salt and 1/2 a cup of flour at a time. Blend until just incorporated. Do not overmix.
Pour batter into pans and bake for 45 to 55 minutes or until toothpick comes out clean. Do not over bake or bread will be dry.
Let bread cool in pan for 5 minutes before inverting onto wire rack. I always loosen the sides by sliding a sharp knife along the edges first.
While bread is cooking combine all the ingredients for the glaze, except for the vanilla, into a small sauce pan. Bring to a boil over medium heat, stirring constantly.
Pour glaze over warm bread.
Cool before serving.