1 1/2 tablespoons fine dry plain bread crumbs
1 cup chopped onions
1 cup diced cooked ham (1/4 pound)
1 tablespoon unsalted butter
1 (8-ounce) package shredded Swiss cheese (2 cups)
4 large eggs
1 cup heavy cream
1 cup whole milk

1. Preheat oven to 425°F with rack in middle.

2. Butter quiche dish, then sprinkle all over with bread crumbs.

3. Cook onions with ham in butter in a 12-inch heavy skillet over medium-high heat, stirring occasionally, until pale golden, about 5 minutes. Spread in dish, then evenly sprinkle cheese on top.

4. Whisk together eggs, cream, milk, and 1/2 teaspoon pepper and pour over cheese. Bake until top is golden and custard is set in center, 20 to 25 minutes. Cool slightly before cutting into wedges.