Preheat your oven to 350°F (177°C).

In a large mixing bowl, slice your peaches and combine them with cane sugar, lemon juice, cornstarch, and optional vanilla extract.

Carefully pour the peach mixture into your prepared casserole dish, spreading it evenly.

In a clean bowl, whisk together all-purpose flour, brown sugar, rolled oats, ground cinnamon, baking powder, and salt.

Add cold vegan stick butter to your dry ingredients and mix until large crumbs form.

Sprinkle the crumble topping over the prepared peach filling.

Bake for 30-45 minutes, until the topping is golden brown and the filling is bubbly.

Let cool for 10-15 minutes before serving.