I’ve only made cake pops twice. The first time I added some leftover SMBC & orange curd. Neither of which is too sweet and I think I only added a couple of spoonfuls. The second time it was a chocolate cake and I added a couple of spoonfuls of orange marmalade until I had the right consistency. Like Dina, I keep adding a spoonful at a time until it was just right. Some people also add liqueurs. Might try it when it is for adults.