01 -
Melt butter in a saucepan over low heat.
02 -
Add brown sugar and stir until dissolved.
03 -
Pour in milk while stirring.
04 -
Turn heat to medium and bring to a gentle boil.
05 -
Keep boiling for 2-3 minutes stirring constantly.
06 -
Remove from heat and let cool until warm.
07 -
Beat in 2 cups powdered sugar until smooth.
08 -
Add more powdered sugar if needed for thickness.
09 -
Mix in vanilla extract.
10 -
Use right away while still spreadable.