Line a baking tray with baking paper and arrange the Salada crackers in a single layer.
In a medium saucepan, combine chopped butter and brown sugar. Heat over medium, stirring until boiling. Let it thicken for about 30 seconds.
Pour the hot toffee evenly over the crackers.
Bake in the preheated oven for about 5 minutes.
Remove from the oven and immediately place white chocolate blocks on top. Allow them to melt for a few minutes, then spread the chocolate evenly over the toffee.
Sprinkle M&Ms and any additional decorations over the melted chocolate.
Chill in the refrigerator for 1 to 2 hours until set.
Break into pieces and enjoy!
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Notes
Store leftovers in an airtight container at room temperature for up to two weeks.