Preheat your oven to 350°F (175°C).
Peel and slice the apples, then arrange them in a pie dish, filling it about two-thirds full.
Sprinkle the apple slices with 1 tablespoon of sugar and 2 teaspoons of cinnamon.
In a mixing bowl, combine the melted butter, 1 cup of sugar, 1 cup of flour, the beaten egg, a pinch of salt, and the chopped walnuts.
Mix the ingredients until a dough forms.
Crumble the dough over the apples, ensuring most of the apple slices are covered.
Place the pie dish on a sheet tray and bake for 45 minutes to 1 hour, or until the topping turns golden brown.
Allow the crisp to cool for a few minutes before serving, and consider pairing it with vanilla ice cream.
