2 pounds ripe but firm peaches (about 5 medium peaches)
halved
pitted
and cut into 1/2-inch-thick slices
Instructions
Heat the oven to 425 degrees F and arrange a rack in the middle.
Place all of the ingredients in a large bowl.
With your fingertips, blend the butter pieces into the dry ingredients until large clumps form and the flour and butter are completely incorporated, about 3 minutes.
Crumble the clumps into small pieces the size of kidney beans, then refrigerate the streusel while you make the filling for the pie.
Place the brown sugar, lemon juice, cornstarch, vanilla, and salt in a large bowl and whisk to combine.
Add the peaches and stir until evenly coated.
Transfer the mixture to an 8-by-8-inch glass or ceramic baking dish and arrange it in an even layer.
Sprinkle the reserved topping evenly over the peaches.
Bake until the topping is browned and crisp, about 20 to 25 minutes.
Place the dish on a wire rack to cool for at least 30 minutes before serving.