Make strawberry puree: Simmer 150g strawberries with 1 tbsp sugar and 1 tsp lemon juice for 10 minutes. Blend smooth and cool.
Bake cake: Preheat oven to 165°C. Cream butter and sugar. Add egg whites and vanilla. Alternate dry ingredients and buttermilk, fold in puree. Bake 25 min in lined pan. Cool.
Crumble cooled cake finely. Mix in 115g cream cheese until dough-like.
Scoop 20g balls, roll smooth. Chill 30 min.
Dip stick ends in melted candy melts, insert into balls. Chill again.
Dip pops in melted candy melts, tap excess. Sprinkle freeze-dried strawberries. Stand to set.