Line an 8x8" pan with half of the graham crackers, making one layer, not overlapping, breaking to fit if needed.
In a large bowl, whip the cream until soft peaks form. Add the flour, sugar and vanilla and continue beating on high until stiff peaks form. Fold in sprinkles.
Spread half of the whipped cream onto the graham crackers. Top with a second layer of graham crackers and spread with the remaining whipped cream.
Cover with plastic wrap and refrigerate for 5-6 hours or overnight. Top with additional whipped cream and sprinkles if desired before serving.
This cake can also be frozen completely and even served partly frozen!
Notes
*To heat treat flour, place in a microwave safe bowl and microwave on high heat on high heat for 30 seconds. Stir and heat again on high heat for 15-20 more seconds.