1-First Step: Prep and mise en place
Preheat your oven to 375°F. Line a 9×13-inch baking dish or use a similar-sized ovenproof pan. Peel, core, and slice 5-6 large apples. Aim for even slices about 1/4-inch thick so they bake uniformly. Place the sliced apples in a large bowl and toss immediately with 1 tablespoon lemon juice to stop browning and add brightness.

2-Second Step: Mix sugars, spice, and cornstarch
In the bowl with apples, add 1/4 cup light brown sugar, 1 tablespoon granulated sugar, 2 teaspoons cinnamon, and 2 teaspoons cornstarch. Toss gently so every slice is coated. The brown sugar gives depth while the cornstarch will thicken the cooking juices into a caramel-like sauce.

3-Third Step: Assemble in the baking dish
Pour the tossed apple slices into the prepared 9×13-inch baking dish, spreading them into an even layer. Scatter 2 tablespoons sliced unsalted butter over the top so it melts and aids caramelization as the apples release juice. If you like, tuck in optional mix-ins now: chopped nuts, fresh or dried cranberries, raisins, or thin pear slices. Keep in mind that maple syrup or coconut sugar will cut down on classic browning if you use them.

4-Fourth Step: Cover, bake, and stir for even caramel
Cover the baking dish with foil and place it in the 375°F oven. Bake for 30-40 minutes total, but plan to stir the apples every 10-15 minutes. Stirring helps the fruit soften evenly and encourages the juices to concentrate into a glossy cinnamon sauce rather than separating. Check at 30 minutes; if apple slices are fork-tender and the sauce looks caramelized, you can remove the foil for the last 5-10 minutes to deepen color.

5-Fifth Step: Finishing touches and serving
Once the apples are tender and the sauce is bubbling and thickened, remove from the oven and let cool 10 minutes before serving. The brief cooling time lets the sauce set a bit so it clings to the slices. Serve warm with vanilla ice cream or whipped cream, or spoon over morning oatmeal or pancakes for a sweet breakfast topping. For vegan servings, substitute coconut oil for butter and use nondairy ice cream.