Preheat your oven to 350ºF and line an 8" square baking dish with parchment. Alternatively, you can spray with a nonstick cooking spray - however you prefer to prep your pans for baking brownies or blondies!
Begin by adding your butter and white chocolate to a medium saucepan. Heat these over a medium low heat until melted smooth, stirring occasionally with a spatula.
6 tablespoon unsalted butter, 2 oz white chocolate chips
Remove from the heat and add the sugar, stirring to combine.
1 cup granulated sugar
Add your eggs and vanilla, stirring to combine into a smooth batter. As the pan may still be warm, be sure to stir while adding the eggs to avoid them scrambling. If concerned, its always good to beat them gently first before adding which makes them quicker to incorporate.
2 large eggs, 1 teaspoon vanilla extract
Sift the flour, baking powder and salt into the batter. Stir with your spatula until just combined.
¾ cup all purpose flour, ½ teaspoon baking powder, ¼ teaspoon salt
Add the dark chocolate chips and stir to distribute in the batter.
3 oz dark chocolate chips
Pour the blondie batter into your prepared baking dish and spread evenly. Add dollops of hazelnut spread on top of the batter and swirl with a butter knife or toothpick to help distribute across the blondies.
4 tablespoon hazelnut creme
Top with a few Happy Hippo candy bars. These will sink a bit into the batter while baking, so no need to press down too firmly into the top of the blondies.
5 Kinder Happy Hippos