Let the raspberries thaw. Melt the butter. Heat the cream and milk in a saucepan, do not let it boil. Mix flour and sugar. Stir in eggs one after the other, then add butter and mix. Stir in cream mixture.
Spread raspberries in a greased ovenproof dish (approx. 22 cm Ø). Pour egg-milk over it and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 45 minutes. Take out and dust with icing sugar.