Preheat the oven to 350° and line a 9 x 13 pan with foil, spray lightly with nonstick cooking spray. Set aside. In a bowl combine the graham crackers and the coconut oil. Press the graham cracker mixture into the bottom of the pan evenly and bake for 10 minutes. Meanwhile, in a bowl beat the cream cheese, greek yogurt, truvia, cool whip, vanilla extract, lime zest, and juice of 1 lime. Beat on medium speed for 2-3 minutes or until ingredients are smooth and fluffy. Remove the graham cracker crust from the oven and allow to cool completely before pouring in the lime cheesecake mixture. Refrigerate for 2-3 hours or until the bars have set completely. Score the bars into 16 slices and serve.