Preheat the oven to 400 degrees.
Follow the pie crust instructions for thawing, and place crust over a 9 inch ungreased pie pan.
Flute the edges of the pie by pressing your index finger on one hand, in between your index finger and thumb on the other hand. Set aside.
In a large bowl, prepare the filling by mixing the apples, lemon juice, flour, cinnamon, sugar and vanilla. Then, pour into prepared pie pan.
To make the crumble topping, combine the brown sugar, cinnamon, flour and room temperature butter in a medium bowl. Use a fork and press the butter into the other ingredients, until the mixture is nice and crumbly.
Pour the crumble topping on top of the pie.
Bake the pie for 15 minutes at 400 degrees, then lower the temperature to 375 and bake for an additional 35 minutes.
Allow the pie to cool completely before serving. Top with ice cream and caramel drizzle for the ultimate treat.