In a large mixing bowl, toss the sliced apples with lemon juice, 1/4 cup granulated sugar, 1 teaspoon ground cinnamon, and 1/4 teaspoon salt. Transfer the apple mixture to a greased 9x13-inch baking dish.
In another mixing bowl, combine the rolled oats, flour, brown sugar, remaining granulated sugar, cinnamon, nutmeg, and melted butter. Mix until crumbly.
Evenly distribute the oat mixture over the apples in the baking dish, ensuring the apples are well covered.
Bake in the preheated oven for 40-45 minutes, or until the apples are bubbly and the topping is golden brown.
Allow the apple crisp to cool slightly before serving.
Notes
Serve warm, topped with a scoop of vanilla ice cream for a delicious contrast to the warm cinnamon apples.