Little white chocolate and rhubarb cakes

Ingredients

• 100 gram butter, melted
• 1 cup brown sugar
• 2 eggs
• 1/2 teaspoon baking soda
• 1/2 cup milk
• 1 1/2 cup plain flour
• 2 teaspoon baking powder
• 1/2 cup ground almonds
• 1 cup raw rhubarb, cut into 1cm cubes
• 100 gram white chocolate buttons or chips or chopped white chocolate
• icing sugar, to dust (optional)