Butter a baking pan, about 30 × 30
Set the oven to 200 °C (392 °F)
Assemble the beater bowl with balloon whisks and add eggs and sugar
Whisk until the batter is fluffy.
Add all dry ingredients, and shells in the egg batter.
Pour the batter into the prepared baking pan and top with the blueberries evenly over the batter.
Finally, plane refrigerator-cold butter over the blueberries and batter.
Bake for about 20-25 minutes
Follow these steps
- 5 eggs
- 360 g sugar
- 1 tbsp vanilla sugar
- 1 g salt
- 240 g flour
- 1.5 tsp baking powder
- Finely shredded peel from 1 large lime
- 150 g white chocolate (chopped into pieces)
- 150 g diced butter (refrigerator cold)