It makes a lot I often cut the recipe in half.
Removing the saucepan from the heat source too early leaves a sticky syrup that fails to coat popcorn properly, while keeping it on the burner past its peak turns sugars bitter and acrid. Achieving the correct sugar consistency relies entirely on observing changes in viscosity and bubble behavior during the boil. Combining brown sugar, corn syrup, butter, and sweetened condensed milk creates a high-sugar solution where water must evaporate until the remaining concentration reaches the soft-ball stage. Specifically, continuous stirring prevents localized burning at the pan bottom while dairy solids undergo Maillard browning. Watch for the foam to transition from large, watery bubbles to a thick, glossy, amber-toned emulsion that coats the back of a metal spoon cleanly. This visual transformation indicates that the water content has dropped sufficiently. Stirring in the vanilla off the heat preserves volatile aromatic compounds that would otherwise flash off at high temperatures. Quantities producing large batches can overwhelm standard bowls, so dividing popped kernels across two wide vessels ensures even distribution during coating.