Mix equal parts of sour cream with cream cheese with a spatula in a mixing bowl until fully incorporated.
Spoon the cream cheese mixture onto a shallow dish or serving platter and pour the sweet chilli sauce into a layer on top, leaving a margin around the edges.
Garnish with the fresh herbs around the border and serve with Thai rice crackers.
Serve immediately or cover and refrigerate until needed.
Notes
You could also add some hot sauce or fresh chillies to give this dip more spice. I add the herbs around the edge as not everyone can eat coriander. This dip will not freeze well.