01 -
On low heat, warm the butter in a saucepan until it melts completely.
02 -
Toss in the brown sugar and stir it around until it’s smooth and fully dissolved.
03 -
Slowly pour in the milk while continuing to mix everything together.
04 -
Turn the heat to medium. Let it boil gently for 2–3 minutes while stirring non-stop.
05 -
Take it off the heat and let the mixture cool down just enough to be warm but not too hot.
06 -
Mix in 2 cups of powdered sugar, beating until smooth and creamy.
07 -
Add extra powdered sugar, little by little, if you want the frosting to be thicker.
08 -
Stir in the vanilla extract so it blends well with the frosting.
09 -
Spread the frosting right after making it while it’s still soft, as it’ll thicken more as it cools.