INGREDIENTS
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2 sticks (1 cup) salted butter
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2 cloves garlic, minced
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1 small yellow onion, halved and sliced
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One 10-ounce jar artichoke hearts, drained and finely chopped
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1 cup heavy cream
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1 teaspoon kosher salt
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1 teaspoon freshly cracked black pepper
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4 ounces cream cheese, at room temperature
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1/4 cup freshly grated Parmesan
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3 cups packed baby spinach
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Nonstick cooking spray, for the baking sheet
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9 sheets frozen phyllo dough, thawed