1. Preheat your oven to 350°F (175°C). Grease a 9×13 inch baking dish lightly with butter.
2. In a large bowl, combine the sliced peaches, granulated sugar, lemon juice, and vanilla extract. Toss them gently to ensure the peaches are well coated. Set aside to let the flavors meld together.
3. In a separate bowl, mix together the flour, oats, brown sugar, cinnamon, and salt. Pour in the melted butter and stir until the mixture resembles coarse crumbs. This is your crumble topping, and it should feel slightly sandy to the touch.
4. Spread the peach mixture evenly in the prepared baking dish. Sprinkle the crumble topping generously over the peaches, ensuring an even layer that will crisp up beautifully.
5. Bake in the preheated oven for about 35-40 minutes, or until the topping is golden brown and the peaches are bubbling around the edges. The smell of cinnamon and buttery oats will fill your kitchen—a sign that you’re almost ready to indulge.
6. Allow the crumble to cool slightly before serving. This will help the juices set a bit, making it easier to dish out.

The first time I made this crumble, I was so eager to dig in that I didn’t wait for it to cool. I learned the hard way that patience truly is a virtue in baking!