1 cup granulated sugar
1 T molasses
In a medium mixing bowl, add the sugar and molasses and use a hand mixer to combine. Use a spatula to scrape down the sides as needed and continue to beat until all the molasses is combined. It will take up to 5 minutes, so be patient and you will have light and fluffy brown sugar.
Note: If you want to make dark brown sugar, use 2 T molasses per cup of sugar.