Make sure the 8-ounce package of Neufchatel cheese is softened; place it in a large mixing bowl with 1 cup sugar (cane or granulated).
Using an electric mixer on medium speed, beat the cheese and sugar until light and fluffy, about 3 minutes, stopping once to scrape down the bowl and beaters.
Add 2 tablespoons molasses (or 2 tablespoons packed dark brown sugar), 1 teaspoon vanilla extract, and 1/8 teaspoon kosher salt.
Beat on low just until the added ingredients are incorporated, then increase to medium-high and beat until the dip is smooth, scraping the bowl as needed (about 20–30 seconds).
Serve immediately, or transfer to an airtight container and refrigerate for up to one week.