Melt the butter in a large saucepan over medium heat. Take the pot off the stove. Add all other ingredients to the butter and stir with the mixer to a smooth mass. Put this mass in a greased drip pan and smooth out. Bake on the middle rack at 175 ° C for 20-30 minutes. Cut into pieces while still hot and dust with powdered sugar.
Note: Cup = normal coffee cup (approx. 170 ml content)