- Preheat your oven to 375°F (190°C) and lightly grease your baking dish to prevent sticking. 
- In a large bowl, toss the sliced peaches with granulated sugar, ground cinnamon, and vanilla extract until evenly coated. The peaches should look glossy and fragrant. 
- Pour the peach mixture into your prepared baking dish, spreading it out into an even layer. The peaches should form a juicy, bubbling base when baked. 
- In a separate bowl, combine the flour, rolled oats, brown sugar, and salt. Mix until well combined. 
- Add the cold, cubed butter to the dry ingredients. Using your fingers or a pastry cutter, work the butter into the mixture until it forms coarse pea-sized crumbs. The mixture should look crumbly but hold together when pressed. 
- Sprinkle the crumble topping evenly over the peaches, covering the fruit completely. The topping should be generous and textured. 
- Bake in the preheated oven for about 35-40 minutes, or until the topping is golden brown and the filling is bubbling around the edges. 
- Remove the crumble from the oven and let it cool slightly. The aroma of cinnamon and baked peaches will fill the room as it cools. 
- Serve warm, ideally with a scoop of vanilla ice cream or a dollop of whipped cream for extra indulgence.