the condensed milk I used was Bärenmarke.
Kondensmilch, wärmebehandelt, 10% Fettgehalt, 17% fettfreie Milchtrockenmasse
Nährwerte pro 100 g:
Brennwert: 637 kJ / 153 kcal
Eiweiß: 5,9 g
Kohlenhydrate: 9,8 g
Fett: 10 g
So perhaps not enough fat. No mention of sugar.