Caramelized Onion and Potato Knishes

Ingredients

• 2 1/2 cups all-purpose flour, plus more for dusting (see Cook's Note)
• 1 teaspoon baking powder
• 1 teaspoon kosher salt
• 6 tablespoons schmaltz, melted and cooled, or neutral oil, such as vegetable oil (see Cook's Note)
• 1 teaspoon distilled white vinegar
• 2 tablespoons schmaltz or neutral oil, such as vegetable oil (see Cook's Note)
• 2 large yellow onions, cut into a medium dice
• Kosher salt and freshly ground black pepper
• 1 tablespoon chopped thyme leaves (from about 12 sprigs)
• 2 garlic cloves, minced
• 1 1/2 pounds russet potatoes, cut into medium chunks
• 5 ounces cream cheese, at room temperature
• 1/3 cup sour cream, plus more for serving
• 1/4 cup dill fronds, chopped
• 2 tablespoons minced chives (from 4 to 6 chives)
• Nonstick cooking spray
• 1 large egg

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