Begin by preheating your oven to 350 degrees F.
In an extra-large bowl, whisk together the eggs, milk, heavy cream, butter, sugars, vanilla, cinnamon, and salt.
Add the donut pieces, toss to combine, cover, and allow the mixture to sit for 20 minutes.
Spray a 9x5 loaf pan with baking spray.
Add the donut mixture to the pan.
Bake for 60-70 minutes or until golden brown.
Allow to cool for 15 minutes.