A Recipe of my mother's that I have used on many a birthday cake.
5 Tbs flour
1 Cup milk
Mix together and cook on low heat in saucepan until it thickens into a paste (stirring constantly). When it forms a ball when stirring then remove from heat and cool.
Beat together til creamy:
1 Cup sugar
1 Cup butter
1 tsp vanilla
Add flour mix to butter mix after it’s completely cooled – Whip together