Cheesy Butternut Squash Onion Knishes

Ingredients

• For the dough:
• 2 1/4 cups all-purpose flour, plus more for rolling out the dough
• 1 teaspoon baking powder
• 1/2 teaspoon kosher salt
• 1 large egg, lightly beaten
• 8 tablespoons unsalted butter, melted and cooled
• 1 teaspoon distilled white vinegar
• 1/2 cup lukewarm water
• For the filling & cheesy topping:
• 1 pound butternut squash, peeled and cut into 1-inch cubes
• 2 tablespoons extra-virgin olive oil
• 4 tablespoons unsalted butter
• 2 large white or yellow onions, thinly sliced
• 1 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• 1 teaspoon granulated sugar
• 4 green onions, finely chopped
• 1/4 cup water, plus one teaspoon
• 4 ounces cream cheese, at room temperature
• 6 ounces aged gruyère cheese, grated
• 1 large egg, beaten
• 3 tablespoons fresh chives, finely chopped

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