Begin by preheating your oven to 350°F (175°C).
Evenly distribute the apple pie filling in an 8x8-inch baking dish. Dust the filling with ground cinnamon and nutmeg to enhance the flavor.
In a mixing bowl, cream together the margarine and brown sugar until smooth. Gradually incorporate the flour, using a pastry blender, until the mixture forms coarse crumbs.
Generously sprinkle the crumb mixture over the apple filling, ensuring an even layer.
Place the baking dish in the preheated oven and bake for approximately 20 minutes, or until the topping is golden brown and crisp, and the filling is heated through and bubbling. Enjoy your delicious homemade apple crisp!