malted milk

Short definition from Wiktionary

Noun

1. 1
   A powder made by mixing malted barley, flour and milk, the mixture then being dried by evaporation; initially developed as a nutritional supplement, later used as a flavouring.
2. 2
   A hot beverage made from a mixture of malted barley, flour, and milk.
3. 3
   A milkshake with malted milk powder added for flavour.