French Onion Soup Bites

Ingredients

• 1/4 cup (1/2 stick) unsalted butter
• 3 cups finely chopped yellow onion (from 2 onions)
• 1 teaspoon granulated sugar
• 1 1/4 teaspoons kosher salt, divided
• 1/4 cup heavy cream
• 1 large egg
• 1 pinch ground nutmeg
• 30 frozen mini phyllo pastry shells (from 2 [1.9-oz.] pkg., such as Athens brand), at room temperature
• 2 oz. Gruyère cheese, grated (about 1/2 cup)
• Finely chopped fresh chives, for garnish

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Recipe Notes 

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