Ingredients

• 1 lb butternut squash, trimmed, peeled (seeds removed) and cut into 1/2" chunks
• 1 and 1/2 cup all-purpose flour, plus more for dusting
• 1/2 red onion, large dice
• 1/2 cup (1 stick) chilled unsalted butter, cut into 1/4" cubes
• 1/4 cup ice water
• 1 whole egg, beaten
• 2 tablespoons extra virgin olive oil
• 1 ounce feta cheese, crumbled
• 1/2 teaspoon kosher salt
• freshly ground pepper