The pan looks like this and is real pretty! *SMILE*
Recipe (makes approx 20 mini cakelets)
2 large yolks weighing 37g
1 1/2 tbsp water
3/4 tsp pure vanilla extract
78g plain flour
50g caster sugar
1 tsp double acting baking powder
1/4 tsp salt
71g unsalted butter at room temperature
1. Preheat the oven at 170 deg with the tray at the lower third position.
2. In a bowl, mix slightly the egg yolks, 1 1/2 tbsp water and vanilla essence.
3. In another larger bowl, whisk the flour, sugar, baking power and salt. Add the butter and mix till well combined.
4. Add the egg mixture in 2 batches to the dry ingredients, ensuring that the batter is well mixed each time.
5. Spoon the batter, filling the pans half full.
6. Bake for 12 to 13 minutes or when the cakes spring back when you touch them with a fingertips.
7. Remove from the pan and cool on wire rack.
Troubleshooting
Now, I would not proclaim to be an expert in baking; just someone who enjoys it and wants to share my passion with the people I love. With this cakelets, this is the 2nd time I have encountered dome or cracked surface with tunnels. My dear pal, Lily had commented that my oven is too hot and rightly so I agree. The only puzzling thing is both of our ovens are the same - Rowenta and hers at 175 deg gave perfect chocolate cupcakes.
Anyhow, my take is my oven is too hot and will reduce to 160 deg the next time. I could have overmixed the batter a tad more too. Taste wise, they passed and I loved them still! Hee.
For other troubleshooting tips, refer to Joy of Baking.