Chop walnuts with a blender (100 g-for the dough, 50 g-for decorating the cake (optional)).
In a bowl, combine the yogurt, eggs and sugar. Stir.
Add flour, a pinch of salt , baking powder and 100 g of chopped nuts. Mix thoroughly until smooth. The dough turns out thick , with a spoon does not flow.
Add pineapple slices (remove them from the jar and let the syrup drain). Gently mix the dough.
Put the dough in a cupcake mold ( the size of the mold is wide.11 cm, height. 7 cm, long. 25 cm; covered the form with parchment , slightly greased with vegetable oil).
Bake the cake in a preheated 180-degree oven for about an hour (focus on the features of your oven, check the readiness with a wooden skewer). Remove the finished cake from the oven and let it cool completely.
Next, decorate the cupcake as desired and mood. You can sprinkle with powdered sugar , make icing sugar or chocolate.