Many old-fashioned recipes call for a "Powdered Sugar Glaze or frosting. Here's a tutorial on what that drizzle recipe is for the tops of cakes and pastries.
Add the heavy cream a tablespoon at a time until you reach the consistency you'd like your icing or drizzle to be.
Add the flavor extract of your choice.
Mix well and immediately drizzle or spread over cookies, cakes or breads.
Notes
*Instead of cream you can use milk, half and half or even lemon juice or apple cider. Whatever liquid you choose, just add it slowly to the sugar, one tablespoon at a time, until the glaze is at the right consistency.