Cheesy Bacon Croissant Bake

Name: Cheesy Bacon Croissant Bake
Ingredients: 454 g (1 lb) of croissants, split down the middle and ripped into big chunks (around 4 large croissants or 5-7 smaller ones).; 8-10 slices of thick cut bacon, chopped up and cooked till crisp.; Half a cup of diced red onion or shallot, sautéed so it's soft and clear.; 2 cups of freshly shredded Swiss, gruyere, or cheddar cheese (melts better this way).; 9 large eggs, whisked until smooth.; A couple of cups of whole milk (steer clear of skim).; 1 cup of thick heavy cream.; 1 1/2 teaspoons of salt.; A quarter teaspoon of black pepper.