Prepare the Fruit Filling: In a large bowl, combine the thawed sliced peaches, thawed diced mangos, lemon juice, white sugar, dark brown sugar, all-purpose flour, vanilla extract, and a pinch of salt. Stir gently until the fruit is evenly coated, and the sugars start to dissolve. This fruit filling will create the thickened, flavorful center of your pie.
Assemble the Pie: Place a premade or store bought pastry dough into a 9” pie plate as the bottom crust. Using a pastry brush coat the pie dough with a light coating of egg wash to seal the crust. Spoon the fruit filling into the crust.
Crumb Topping: Mix flour, brown sugar, apple pie spice, melted butter and chopped pecans in a bowl until small pea sized pieces come together. Spread this mixture evenly across the top of the fruit filled pie crust.
Bake: Preheat your oven to 400°F (205°C). Place a metal baking ring or aluminum foil tented over top of the pie to keep it from over browning. Bake your peach mango pie for 15 minutes at 400°F before lowering the temperature to 350°F (190°C) for an additional 35-45 minutes. The top of the pie should be golden brown, and the fruit filling should be bubbling through the crumble.
Cooling and Serving: Allow the pie to cool for at least 1 hour before serving. This helps the fruit juices thicken up and makes slicing easier. Serve your pie with a scoop of ice cream for the ultimate dessert experience.