Smoked Salmon And Bagel Breakfast Casserole

Ingredients

• butter, for coating the baking dish
• 8 ounces cold cream cheese
• 1 pound “everything” bagels (about 4 to 5 bagels), cut into 1/2-inch cubes
• 3 tablespoons finely chopped fresh chives (from about 1 bunch)
• 8 large eggs
• 3 1/2 cups whole milk
• 2 teaspoons kosher salt
• 1/4 teaspoon freshly ground black pepper
• 4 ounces sliced smoked salmon, cut into bite-sized pieces
• 2 tablespoons capers, coarsely chopped
• 2 tablespoons minced red onion