Start with your apples—crisp, cool, and freshly peeled. Toss them straight into a big bowl with a shower of sugar, a generous squeeze of lemon juice, a sprinkle of cinnamon, and a little cornstarch. Stir everything together and breathe it in—the smell is almost like autumn getting ready in your kitchen. The apple mix should look glossy and feel just a bit sticky, clinging to the edges.

Next, work on the crumble topping. In another bowl, stir together the flour, brown sugar, baking powder, salt, and cinnamon—make sure any brown sugar lumps get broken up, or they’ll caramelize in random pockets. Pour over the melted butter and use a fork (or your fingers, honestly) to bring it together until you get thick, nubby clumps and a few dry bits. The mixture should look more like gravel than like bread dough; uneven is the goal.

Tip your apple mixture into a baking dish and smooth it out so you have an even layer. Scatter the crumble over the top, making certain there are both big chunks and sandy bits—this is what gives you both crunch and tenderness. Into the oven it goes, and now your kitchen is about to smell like pure heaven.

Keep an eye out as it bakes. The juices from the apples will bubble around the sides and the topping should turn a solid, deep golden, especially at the edges. Don’t be tempted to pull it out too soon; that extra five minutes makes the difference between just-done and so-good-you-can’t-stop-eating.