A lunchbox staple in our house and easy to melt butter and marshmallows in the microwave - no heating up the kitchen in Summer! This recipe comes from the failsafe website.
200 g of home-made marshmallows (see recipe elsewhere or 2 x 100g packets of Pascall's white marshmallows)
80 g butter or Nuttelex
4 cups rice bubbles
Measure rice bubbles and place them in a large bowl. Line a lamington/ swiss roll tray with ovenbake paper. Melt marshmallows & butter over low heat, stirring so it doesn't burn. Alternatively melt butter in microwave, add marshmallows and microwave on high for another 30 seconeds. Pour the marshmallow and butter mix onto the rice bubbles. Mix well. Tip into lined tray and press down. This may work best with a metal spoon as the mixture cools.