Marshmallow squares

This is the recipe for the marshmallow squares I made for my birthday. 1 batch will give you 20-25 pcs.

125 g of butter, roomtemperature
2 1/3 dl cream sugar
3 eggs (2 eggworms saved to the meringue)
3 1/2 dl of wheat flour
1 teaspoon baking soda
1 pinch of salt

Filling
100 g chopped hazelnuts
100g coarse chopped dark chocolate
50 g minimarshmallows
2 dl of brown sugar.

Set the oven to 175 degrees. Whisk butter and sugar with an electric mixer.
Add a whole egg and two egg yolks (save the two egg whites in a clean bowl). Beat the batter airy.
Mix flour, baking soda and salt. Stir it in the butter mixture
Dress a baking tin, about 20×30 cm, with baking paper. Wipe out the batter in the mold.
Distribute chopped nuts, chocolate and marshmallows over the batter.
Beat the two egg whites that were previously turned over to a hard foam. Add, and mix carefully, in the brown sugar. Wide the meringue over the cake.
Bake the cake in the middle of the oven for 30-40 minutes. Allow it to cool before cutting squares.