Begin by preheating your oven to 350°F. Prepare an 8×8 baking dish by either buttering it or lightly coating it with non-stick spray. Set it aside.
In a large bowl, toss the chopped apples with the granulated sugar, 3/4 teaspoon of the cinnamon, and lemon juice. Stir until the apples are well-coated, then transfer them evenly into the baking dish.
For the topping, combine the brown sugar, oats, flour, remaining 1 teaspoon of cinnamon, and a pinch of salt in a separate bowl. Add the diced cold butter. Using a pastry cutter, cut the butter into the mixture with a twisting motion until it resembles pea-sized crumbs. If you prefer, two forks or your hands can also be used to incorporate the butter.
Once the topping is ready, sprinkle it evenly over the apples in the baking dish, lightly pressing it down to create an even layer. Bake for 40 to 50 minutes or until the topping is golden brown and the apples are bubbling at the edges.
Serve this delightful apple crisp warm and enjoy its comforting flavors.