Heat oven to 350 F. Line 24 muffin cups with paper liners. In a medium bowl, whisk flour, 1 cup of sugar, the baking powder, baking soda and salt until blended.
In a large bowl with electric mixer, beat eggs, orange zest, vanilla, and orange extract until blended. Beat in 1 cup vanilla sugar. Beat in oil, then buttermilk, until blended.
On low speed, beat in flour mixture just until blended. Spoon about 1/4 cup batter into each muffin cup.
Bake 25 to 28 minutes until wooden pick inserted in center comes out clean. Remove to wire rack to cool completely.