Heat the oven to 180C (160C fan). Brush two small skillets (mine were 22 cm in size) with some butter and set aside.
In a large bowl, beat together the softened butter and both sugars until light and fluffy (you can do it with electric mixer or by hand). Add eggs, one at the time.
Add the flour, malted milk powder, baking powder and a pinch of salt and stir the mixture until it forms the dough. Add the chocolate chunks (I've used a mixture of dark and white chocolate) and stir it to combine.
Divide the dough in two, transfer into the skillets, smooth over with spatula/spoon and bake for about 15-18 minutes until top is golden brown and the middle is just set.
Take out of the oven and allow it to cool for 10 minutes. Top with some ice cream if desired, enjoy!