Beat eggs with sugar until white foam. Add soft butter and sour cream, whisk again.
Add flour with baking powder and mix until smooth.
Put the dough in a cupcake form without filling it to the end, somewhere around 2/3.
Cut the pear into slices. Paste into the dough.
Bake in a preheated oven at 180 degrees for about 25 minutes. Sprinkle with powdered sugar if desired.