Preheat oven to 350 degrees and grease a rimmed cookie sheet (also called a jelly roll pan).
In a large mixing bowl, mix together the flour, brown sugar, salt and cinnamon and butter with your fingers or fork until crumbly.
Mix in the pecans to create the streusel topping. Set aside.
Pop open the cinnamon roll containers and lay out cinnamon rolls onto a cutting board
Cut the cinnamon rolls in half.
Flatten out each half evenly and place onto the cookie sheet to cover the entire bottom and sides.
Spread the 4 cans of apple pie filling evenly on top of the cinnamon rolls.
Sprinkle the streusel evenly on top of the apple pie filling.
Bake in the oven for 50 - 65 min or until the cinnamons rolls are golden brown on top.
Allow to cool for an hour.
Place the cinnamon roll icing into a small bowl and heat in the microwave for 30 seconds.
In a medium bowl, whisk together the softened cream cheese and the icing until smooth.
Drizzle the frosting over the slab pie.
Cut into squares and enjoy!