Start by preheating your oven to 350°F (175°C). While that’s heating up, grab a bowl and toss your sliced apples (about 4 cups) with lemon juice to keep them from browning. This little gem of a tip will also add a nice zing to the apples!

In a medium bowl, combine 1¼ cup all-purpose flour, 6 tablespoons of brown sugar, 6 tablespoons of quick oats, and a generous ½ teaspoon of cinnamon. These ingredients will create the delicious topping that contrasts beautifully with the soft apples below.

Step 3: Add in the Butter

Now, melt ½ cup of unsalted butter (you can do this in the microwave or on the stove). Once it's melted, pour this over your dry mixture. Use a fork to mix it all together until it resembles wet sand—this ensures the topping will be delightfully crumbly after baking.

Grease a baking dish lightly with butter or non-stick spray to prevent sticking. Spread the apple mixture evenly in the bottom of the dish, then sprinkle the oat topping generously over the apples. Make sure to cover the apples completely for an even bake.

Now, it’s time for the magic. Place your assembled apple crisp in the oven and let it bake for about 30 minutes, or until the topping is golden brown and the apples are bubbling underneath. You'll know it's done when your kitchen fills with an irresistible fragrance.