In a medium bowl, stir together the 1 cup powdered sugar, 2-3 Tablespoons heavy cream and 1/2 teaspoon vanilla until smooth.
Add more cream as needed to thin out the consistency. You want it to be smooth and slightly thicker so that it doesn't run off your baked goods. Taste and add salt or more vanilla, if desired.
Drizzle or pipe. Place in a zip-top bag and snip the end or use a spoon to drizzle over the top of cookies, doughnuts, quick breads, or muffins. Best used immediately.
Notes
Storage: This glaze will keep at room temperature for up to 3 days. The small amount of milk is preserved by a large amount of sugar and will remain safe.