Ingredients

1   l-lb loaf challah or brioche, cut into 3/4-inch cubes 3   tbsp unsalted butter, plus more for dish 1   lb assorted mushrooms (such as cremini, oyster, shiitake), cut into 1/4- to 1/2--inch slices 1   tbsp dry sherry (optional) 4   medium leeks, halved lengthwise, then cut into 1/4-inch slices 2   garlic cloves, minced 1-1/4   tsp kosher salt 1   tsp chopped fresh thyme 6   large eggs 2   cups heavy cream 1   cup whole milk 3/4   cup shredded Swiss cheese 1/4   cup freshly grated Parmesan 1/2   tsp ground pepper

Description

1   L-lb Loaf Challah Or Brioche, Cut Into 3/4-inch Cubes 3   Tbsp Unsalted Butter, Plus More For Dish 1   Lb Assorted Mushrooms (such As Cremini, Oyster, Shiitake), Cut Into 1/4- To 1/2--inch Slices

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