Liquefy the butter:

In a small saucepan set over medium heat, liquefy the butter.

Whisk in maple syrup:

Add the maple syrup and stir with a whisk until fully incorporated, then take the pan off the heat.

Mix in vanilla and sugar:

Mix in the vanilla extract, gradually add the powdered sugar, and incorporate the salt, stirring until the mixture is smooth.

Glaze baked items:

Pour the glaze over baked items of your choice or submerge donuts directly into it.