Preheat oven 375. Grease 12 muffin cups or line them with liner papers.

In a large bowl, mix together sugar and orange zest.Add flour, baking powder, and salt, and mix combine. In another medium bowl, whisk eggs with melted butter, sour cream, milk, orange juice, and vanilla extract until well combined. Make a well in the dry ingredients and pour the wet ingredients into it, then stir with a wooden spoon or rubber spatula just until combined. Do not over mix. If mix seems dry add a little orange juice to thin out.

Divide batter evenly between muffin cups, almost to the top. Bake 15-20 minutes or until a toothpick inserted into the center of the muffin comes out clean. Allow to cool 10 minutes, then removes muffins from tin.

To make orange drizzle place powder sugar (sifted) in small mixing bowl. Add orange juice slowly, a bit at a time and whisk until you get a thick yet pourable consistency. Once muffins have cooled, pour glaze over the tops using a tablespoon, letting it drizzle down the sides. Enjoy