01 -
Set your oven to 375°F. Take an 8x8 pan, grease it, then place parchment paper inside, leaving edges to hang out.
02 -
Stir together the flour, cinnamon, sugar, and salt. Add butter and vanilla, working it until it sticks together when pressed.
03 -
Take out 3/4 cup of the mixture and save it for the topping. Press the rest firmly into the pan for the base.
04 -
Mix the egg, sugar, sour cream, flour, vanilla, salt, and cinnamon in a bowl. Gently fold in the peach slices.
05 -
Pour the peach mixture onto the base, then evenly scatter the crumb topping you set aside earlier.
06 -
Put it in the oven for about 50 minutes, until the crumble is golden and crisp. Let it cool for an hour before serving.