Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking dish.

In a large mixing bowl, whisk together eggnog, eggs, whole milk, granulated sugar, vanilla extract, ground cinnamon, ground nutmeg, and salt until smooth.

Add the cut-up glazed donuts to the custard mixture and gently stir to ensure they're fully soaked. Optionally, fold in raisins or cranberries.

Let the mixture sit for 10-15 minutes to allow the donuts to soak up the custard.

Pour the mixture into the prepared baking dish and spread it evenly.

Bake for 40-50 minutes, until golden brown and the center is set.

Remove from the oven and allow to cool for about 10 minutes before serving.

Serve warm with whipped cream and a sprinkle of cinnamon or nutmeg.