Preheat the oven to 180°C. Line a 12 hole muffin tin with paper muffin cases.
Put the chocolate and butter in a heatproof bowl. Microwave on medium (500W) for 2 minutes, stir then microwave for a further 2 more minutes until smooth. Alternatively, rest the bowl over a pan of gently simmering water until the ingredients melt.
Stir together the flour, baking powder, bicarbonate of soda, cocoa powder and Freesweet in a large bowl.
In a jug, lightly mix together the soured cream and eggs. Pour into the dry ingredients with the melted chocolate mixture. Mix together until just combined.
Divide the mixture between the prepared paper cases and bake the muffins for 18 minutes until risen and firm. Cut a heart shape out of a piece of paper, rest paper over a muffin and dust with sieved Freesweet.
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