Put all of the ingredients into a small bowl and whisk until smooth.
Store any leftover glaze in an airtight container in the refrigerator.
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Notes
One: Storage
Store in a sealed, airtight container at room temperature for up to two days, in the fridge for up to a week, or in the freezer for up to three months.
Two: Thickness
If it is too thick, stir in more half-n-half a teaspoon at a time. Or if it is too thin, add more powdered sugar, a tablespoon at a time.
Three: Chocolate
Sift together 1 cup powdered sugar and 2 tablespoons unsweetened cocoa powder. Add 2 1/2 to 3 tablespoons of half-n-half and 1/2 teaspoon vanilla. Whisk until smooth. Stir in 2 tablespoons of melted butter for a creamier texture.
Four: Flavored
Use a flavored extract such as almond, maple, or peppermint instead of vanilla. Or replace some of the cream with lemon juice, orange juice, or lime juice.
Five: Butter
Whisk together 4 tablespoons melted butter, 1 cup powdered sugar, 1 tablespoon hot water, and 1/2 teaspoon vanilla extract.
Six: Glaze Without Powdered Sugar
Heat 1 cup granulated sugar and 1/2 cup water (or lemon juice or milk) in a saucepan on the stovetop (or in a bowl in the microwave), stirring often until the sugar is melted. Do not bring it to a boil. Stir in 1/2 teaspoon of vanilla extract after removing it from the heat. Slowly pour over a cake allowing it to soak in as you go.