Step 1: Prepare the Crust

1. Mix Dry Ingredients: In a large bowl, combine flour, sugar, and salt.
2. Incorporate the Butter: Add cold cubed butter and use a pastry cutter or fork to cut the butter into the flour until the mixture resembles coarse crumbs.
3. Add Ice Water: Gradually add ice water, one tablespoon at a time, mixing just until the dough starts to come together.
4. Chill the Dough: Form the dough into a disk, wrap it in plastic wrap, and chill it for at least 30 minutes.

Step 2: Prepare the Peaches

1. Slice the Peaches: Peel and slice the ripe peaches into even wedges.
2. Mix the Filling: In a large bowl, toss the peach slices with sugar, cornstarch, lemon juice, vanilla extract, and cinnamon if using. Let the peaches sit for about 10 minutes to release some juice.

Step 3: Roll Out the Dough

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Roll the Dough: On a lightly floured surface, roll out the dough into a circle about 12 inches in diameter and ¼ inch thick.
3. Transfer to Tart Pan: Carefully transfer the dough to a tart pan, pressing it gently into the edges and trimming any excess.

Step 4: Assemble the Tart

1. Add the Peach Filling: Arrange the peach slices in concentric circles over the dough. Pour any remaining juice from the bowl over the peaches.
2. Bake the Tart: Place the assembled tart in the oven and bake for 40-45 minutes, or until the crust is golden and the peaches are tender and bubbling.