The most delicious chocolate dessert. "BROWNIE"

Recipe:
250 g chocolate (60-70% cocoa),
120 g butter,
3 eggs (net weight 160 GR),
225 g sugar,
110 g flour,
a pinch of salt,
100 g nuts.
Baking temperature 170 degrees,
Baking time 25 minutes.
Mold size 20 x 20 cm.