Chocolate + Peanut Butter + Cupcakes = Yes. At first I thought it was chocolate chip cookie dough on the very top-- which makes me think that could be tried, too. Chocolate batter, gob of peanut butter in the middle, cookie dough on top.
Frosted courgette & lemon cake recipe - Recipes - BBC Good Food - customised recipe by adding sultanas and lashings of lemon curd as a filling
It's not hard to remember the proportions of this recipe - the weight of flour, butter, sugar and eggs is the same. Then, you can add whatever you like - in this case, pears and chocolate.