- Preheat oven to 220°C / 425°F. Line a 12-cup muffin tray with paper liners. 
- In a large bowl, whisk together eggs, caster sugar, melted butter, milk, and yoghurt until smooth. 
- Sift in flour, baking powder, bicarb soda, and salt. Gently fold until just combined. 
- Add raspberries and chocolate chips. Fold carefully to avoid overmixing. 
- Divide the batter evenly between the muffin liners, filling each almost to the top. Sprinkle with raw sugar for a golden, crunchy top (optional). 
- Bake for 5 minutes at 220°C / 425°F, then reduce oven temperature to 180°C / 350°F and continue baking for 15–18 minutes, until muffins are golden and cooked through. 
- Cool slightly on a wire rack, then dust with icing sugar and drizzle with melted chocolate before serving.