Preheat oven to 425°F (220°C). Have your oven friend ready to roast in peace. Roll out crusts or unroll pre-made crusts and line your pie dish.
In a bowl, toss peaches and raspberries with sugar, cornstarch, lemon juice, salt, and vanilla if using. Make sure every fruity piece is lightly coated.
Pour filling into the crust-lined dish. Dot the top with butter pieces for melty goodness.
Top with the second crust or create a lattice design. Seal the edges and cut a few vent slits so the steam can escape (your pie will thank you).
Bake 20 minutes at 425°F, then reduce to 375°F (190°C) and bake 30–35 minutes more, until the crust is golden and the filling is bubbling.
Cool at least 2 hours before slicing. Yes, patience pays off here—you’ll dodge a soggy bottom like a pro.