Preheat the oven to 350°F. Spray an 8×8-inch baking dish with nonstick cooking spray.
Add the sliced apples, pumpkin puree, brown sugar, flour, pumpkin pie spice, cinnamon, vanilla extract, lemon juice, and salt to a large bowl.
Stir until the apples are evenly coated with the pumpkin mixture.
Pour the apple mixture into the prepared baking dish and spread it into an even layer.
In a separate bowl, combine the oats, flour, brown sugar, pumpkin pie spice, and salt.
Stir in the melted light butter and applesauce until the mixture becomes crumbly.
Sprinkle the oat mixture evenly over the apples.
Bake for 40–45 minutes, or until the apples are tender and the topping is golden brown.
Let the crisp cool for about 10 minutes before serving.