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1 tablespoon extra-virgin olive oil

1 tablespoon unsalted butter

2 cloves garlic, thinly sliced

1 5-ounce package chopped mixed winter greens, such as kale and/or chard (about 8 cups)

Kosher salt

1 sheet frozen puff pastry, thawed (half of a 17-ounce package)

All-purpose flour, for dusting

5 ounces goat cheese, crumbled (about 3/4 cup)

1/2 cup grated Parmesan cheese (about 1 ounce)

4 large eggs

1 cup heavy cream

1/4 teaspoon ground nutmeg

Freshly ground pepper