"Ham and Cheese" Breakfast Casserole

Yield
Serves 6 to 8

Ingredients

4 cups (loosely packed) day-old challah or other egg-enriched bread (3/4-inch cubes) 2 tablespoons olive oil, divided
1 medium yellow onion, thinly sliced 3/4 teaspoon kosher salt, divided 1/4 teaspoon granulated sugar
8 ounces thickly sliced pancetta, diced 6 large eggs
1 1/2 cups whole milk
1/2 teaspoon dry mustard
1/4 teaspoon freshly grated nutmeg 2 teaspoons fresh thyme leaves
1/4 teaspoon freshly ground black pepper
1 cup grated Gruyère cheese (about 4 ounces)

Instructions

Grease an 8-inch square baking dish (or another 1 1/2-quart to 2-quart baking dish) and spread the cubed bread in the bottom.

Heat 1 tablespoon of the oil in a medium skillet over medium heat until shimmering. Add the onions, 1/4 teaspoon of the salt, and sugar. Cook, stirring occasionally, until lightly caramelized (a medium golden-brown color), about 15 minutes.

Meanwhile, in another heavy skillet, heat the remaining 1 tablespoon oil over medium heat and sauté the pancetta until the fat is almost all rendered and it

begins to get crisp, about 8 to 10 minutes. Transfer to a paper towel-lined plate to drain.

Whisk the eggs, milk, dry mustard, nutmeg, thyme, remaining 1/2 teaspoon salt, and pepper together in a large bowl.

Spread the pancetta over the bread cubes, then layer the onions on top. Sprinkle grated Gruyère on next, and then pour the egg mixture over the entire thing.

Press down on the top gently, so that all of the bread cubes get soaked a bit with the egg mixture. Cover and refrigerate overnight.

Arrange a rack in the middle of the oven and heat to 350°F. Take the casserole out of the refrigerator so it can warm on the counter while the oven preheats.

Bake, uncovered, until the edges are bubbling and the top begins to brown, 35 to 50 minutes. The baking time will be greatly dependent on the depth of dish you use. Check the interior with a knife; if it comes out clean the bread custard is baked through. (Cover with aluminum foil near the end of cooking if the top is already browned.)

Recipe notes

Make ahead: The casserole can be assembled, covered tightly with aluminum foil, and refrigerated overnight before baking. Uncover and bring to room temperature before baking.
Storage: Leftovers can be stored in an airtight container in the refrigerator for up to 4 days.

URL to article:  https://www.thekitchn.com/recipe-make-ahead-ham-and-cheese-breakfast-casserole-43364

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