Preheat the oven to 120 degrees Celsius. Grease two loaf pans with butter.
With an electric mixer, mix the butter and sugar until fluffy. Add the eggs one at a time and continue mixing.
Add the orange juice, sour cream, orange zest, and vanilla and mix for 2 more minutes.
In another deep bowl, mix the flour, baking powder, and salt. Add this mixture and the blueberries to the mixer and combine with the wet ingredients.
Pour the batter into the loaf pans and bake for 70-75 minutes or until a toothpick inserted comes out clean.
Remove the loaves from the oven and let them cool for 10 minutes. Unmold.
In a deep bowl, whisk the powdered sugar with the orange liqueur for the glaze. Using a spoon, cover the loaves with the glaze and let them cool before serving.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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