01 -
Heat your oven to 375°F/190°C and either grease a muffin tray or line it with paper cases.
02 -
In a medium bowl, combine the flour, baking powder, and a sprinkle of salt (only add salt if you’re using unsalted butter).
03 -
In a large mixing bowl, whisk the sugar, eggs, and melted butter. Pour in the milk, rum, and vanilla and keep mixing until it’s a bit fluffy.
04 -
Bring the dry mixture into the wet ingredients in batches, gently folding until just mixed. Throw in the butterscotch chips. It’ll look thick and slightly lumpy.
05 -
Spoon about 4 tablespoons of the batter into each muffin cup. Add some sugar and more chips on top, if you like. Bake for 20-24 minutes, then check with a toothpick—it should come out mostly clean.
06 -
Let them cool in the tray for 5-10 minutes before moving them to a cooling rack. You can serve them warm or at room temp. Brushing melted butter on top is optional but recommended.