There are two ways to coat your baked goods.
You can use frosting or you can use icing.
For a recipe for homemade frosting, you can go here.
The difference between icing and frosting is that frosting is more creamy and thick.
It needs to be spread with a knife.
Icing is translucent and is fairly thin.
It is made to be drizzled over whatever you make.
Icing is very simple.
Two, maybe three ingredients and that is it.
1/4 cup powdered sugar
about a Tablespoon milk
1/2 teaspoon vanilla extract, optional
Mix it all together in a small bowl and drizzle over whatever you made.
If it seems to thick add a little more milk until you can drizzle it from a spoon.
This will make enough to drizzle over a quick bread or some breakfast biscuits.
If you want to do a bundt cake or cinnamon rolls, you may need to double the recipe.
If you don't use it right away, the top may form a crust.
If a crust does form, just stir it and it will be fine.