Step 1

Butter a slice pan and line with baking paper. Melt butter in a large saucepan over gentle heat.

Step 2

Add marshmallows and cook, stirring constantly, until marshmallows have melted.

Step 3

Add rice bubbles and stir quickly to combine.

Step 4

Tip bubble mixture into prepared tin and press down using the back of a clean spoon. Once cool, cut into slices or bars.