Instructions:
Combine milk and sugar: In a medium saucepan, add the milk and sugar. Stir to combine.
Heat gently: Place over medium-low heat and cook, stirring occasionally, until the sugar dissolves and the mixture comes to a gentle simmer.
Reduce: Continue cooking uncovered for 30–40 minutes, stirring often, until the mixture thickens and reduces by about half. Avoid boiling hard to prevent curdling.
Add butter: Stir in the butter until fully melted and smooth.
Flavor: Remove from heat and stir in vanilla extract if using.
Cool: Let it cool completely—it will thicken further as it cools. Store in an airtight container in the fridge for up to 1 week.
Quick Blender Method (5 Minutes):
If you need it instantly, blend together:
1 cup powdered milk
2/3 cup sugar
1/3 cup boiling water
4 tablespoons melted butter
Blend until smooth. Use immediately or store in the fridge.
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