- Preheat oven to 400F.
- In large bowl whisk eggs and gradually add sugar, continue whisking until pale yellow in colour.
- Pour in oil, add vanilla and orange zest.
- In a separate bowl stir together flour, salt and baking soda.
- Stir dry ingredients into egg mixture, alternating with the sour cream.
- Gently fold in blueberries.
- Spoon batter into prepared muffin cups.
- Bake in preheated oven for approx. 20 minutes