Smoked Salmon Frittata

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1 medium onion, diced

1 tablespoon unsalted butter

12 extra-large eggs

1 cup heavy cream

4 ounces fresh goat cheese, such as Montrachet, crumbled

1/2 pound smoked salmon, chopped

3 scallions, chopped, white and light green parts

3 tablespoons chopped fresh dill

1 teaspoon kosher salt

1/2 teaspoon freshly ground black pepper