Preheat the oven to 180°C.
Mix the sifted flour, baking powder, cinnamon and clove powder.
Whisk the egg in a bowl and add the sugar. Gradually stir the butter into the egg mixture. Add the rum, yoghurt, sour cream and mix.
Add the flour mixture to the egg mixture and stir until all ingredients are moist.
Peel the pears, cut them in half and cut out the core. Cut the fruit into large pieces and carefully fold them into the dough.
For the butter crumbles, mix the flour with sugar and the cinnamon. Add the warm butter and knead to a crumbly dough, so that crumbles are formed.
Pour the dough into the muffin cups and sprinkle with the crumbles. Bake in the oven at 180°C for 20-25 minutes.