- 100 g (3 ½ oz) white chocolate - 250 g (8 ⅚ oz) white sugar - 3 eggs - 160 g (5 ⅔ oz) all-purpose flour - 180 g (6 ⅓ oz) unsalted butter - 35 g (⅖ cups) cocoa powder (for a brighter blue color, omit the cocoa and replace it with an additional 30 g flour) - ½ tsp. salt - ~1 tbsp of royal blue gel dye - 1-2 drops of violet gel dye
Melt the butter in a saucepan over a low heat, without overheating. Remove from the heat and add the white chocolate to it, stir until dissolved. The butter should not be hot, just slightly warm.
In a large bowl, beat the eggs, add the sugar, stir with a whisk until smooth. Sift in the cocoa, flour, salt and the butter and chocolate mixture. Mix until smooth. Add the blue and purple gel coloring, making sure you get the desired shade.
Place the dough in a square mold about 20 cm wide, lined with parchment. Bake in a preheated oven at 200 °C (400 °F) for 20 minutes. Cool the brownies to room temperature, then cut into portions.