Preheat the oven to 160°C (325°F) and line a 8"x8" baking tin with baking paper.
Place the sugar, brown sugar, flour, cocoa and white chocolate chips in a bowl and mix together.
Melt the butter and pour into the dry ingredients.
Add the eggs and mix.
Add the vanilla and mix until all combined.
Place in the prepared tin and bake for 20-25 minutes or until a skewer inserted in the middle comes out with loose crumbs attached.
Allow the brownie to cool for at least 30 minutes.
Once the brownie is cool, use a fork to 'shred' the brownie into crumbs.
Flatten some of the brownie crumbs in your palm and place a marshmallow halve in the middle and wrap the brownie around it. (If the crumbs wont hold together, add the condensed milk to add more moisture).
Repeat until all the brownie is used.
Melt the white chocolate and dip each truffle in and allow them to set in the fridge for an hour or two.
Notes
You can use any brownie recipe you prefer. You can cover the truffles in any chocolate you like. Milk dark or white or a mixture! You could quarter the marshmallows to make the balls smaller.