Use a mix of firm tart (Granny Smith) and sweeter (Honeycrisp or Fuji) apples for structure and balanced flavor. Don’t oversweeten—let the cranberries shine. For a glossy, well-set filling, toss fruit with sugar, spices, and cornstarch before baking. Brush the crust with egg wash for golden shine. Make-ahead: assemble filling up to 1 day in advance, or freeze the whole unbaked pie up to 3 months and bake from frozen (add 15–20 minutes).