Preheat oven to 325 and prepare a 9x13 by spraying with cooking spray. Set aside.
In a food processor, combine graham crackers and pecans until finely ground.
Melt butter and combine with crumbs, flour, and brown sugar.
Spread mixture in the bottom of a parchment lined pan and cook for 20 minutes, stirring halfway.
Take out the crumb mixture and let cool.
In a kitchenaid, or using a hand mixer, beat egg whites and sugar on medium speed for 3 minutes. Add heavy cream and mix for 6 minutes.
Add juice from one lemon and cream cheese and mix until creamy.
Gently fold in chopped strawberries.
Press half of the crumb mixture into the bottom of your 9x13 pan. Spread strawberries and cream mixture on top and sprinkle the rest of your crumb mixture on top.
Cover with aluminum foil and freeze for at least 3 hours but best if overnight. I also found that if you let it sit out 10 minutes before cutting it is easier to remove the bars.