Follow the steps in order for the best result.
Begin by preheating your oven to a cozy 375°F (190°C), preparing it for baking perfection.
Evenly spread the freshly sliced apples into an 8-inch square baking dish, creating a lovely base for your crisp.
In a separate mixing bowl, combine the all-purpose flour, rich brown sugar, and softened unsalted butter.
Using your fingertips or a pastry blender, work these ingredients together until a delightful crumbly texture with small, pea-sized lumps emerges.
Gently fold in the chopped walnuts, then generously scatter this fragrant, buttery topping over the prepared apple slices in the baking dish.
Transfer the dish to your preheated oven and bake for approximately 40 to 45 minutes. The crisp is ready when the apples are wonderfully tender, and the topping boasts a beautiful golden-brown hue.
For an ultimate treat, serve this comforting apple crisp warm, perhaps with a scoop of vanilla ice cream. It's equally delicious enjoyed at room temperature, bringing a taste of cherished tradition to your table.