Heat the oven at 160°c fan/180 c /gas 4. Grease and fully line with baking paper 2 brownie tins 20 x 20cm
Melt the butter and white chocolate in the microwave for 20 secs or until melted. Leave to cool for 5 minutes.
Add the sugars and eggs to a large bowl and whisk for 2 minutes until thick and foamy. Add the white chocolate mixture into your mixture along with the vanilla essence. Mix together slowly.
Fold in the flour, baking powder and half of the smarties until fully combined.
Evenly distribute the mixture to the two tins. Add the remainder of the smarties on top and press down into the mixture. Bake in the oven for 26 minutes.
Leave in the tins to cool. When cool cut into squares.
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