Combine melted butter, flour, sugar, and cocoa to prepare sprinkling. Mix well until crumbs.
Beat eggs with sugar, add kefir, flour with baking powder, vegetable oil. Mix well and beat with a whisk. Add nuts.
Pour the dough into a baking dish greased with oil, sprinkle with dust on top and bake at 200 degrees 45 minutes.
Take the form higher since the Lush cupcake on kefir rises almost 2 times.