01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Toss pumpkin with olive oil, smoked paprika, cumin, cinnamon, chili flakes, salt, and pepper. Spread evenly on baking sheet. Roast 18–20 minutes until tender. Let cool slightly and mash lightly with a fork.
03 - Combine flour and salt in a large mixing bowl. Cut in cold butter until mixture forms coarse crumbs. In a separate bowl, whisk egg, cold water, and vinegar together. Pour into flour mixture and stir until just combined. Knead briefly, form into a disk, wrap in plastic, and chill for 20 minutes.
04 - In a skillet over medium heat, cook chorizo until beginning to brown, around 3–4 minutes. Add onion and sauté until soft, about 3 minutes. Stir in garlic and cook for 1 minute. Remove from heat and combine with roasted pumpkin and cilantro. Allow mixture to cool to room temperature.
05 - On a floured surface, roll dough to 1/8-inch thickness. Cut out 5-inch circles using a round cutter.
06 - Place 2 tablespoons filling in center of each dough circle. Fold dough over filling to form a half-moon shape. Press edges together and crimp with a fork to seal.
07 - Arrange empanadas on prepared baking sheet. Brush tops evenly with beaten egg. Bake 18–20 minutes until golden brown. Cool slightly before serving.