Preheat oven to 350°F (175°C). Coat an 8-inch square baking pan with non-stick cooking spray.
In a small bowl, combine graham cracker crumbs and softened butter. Mix with a fork until evenly moistened. Press the mixture evenly into the bottom of the prepared pan to form the crust.
In a medium bowl, gently beat the softened cream cheese and sugar until smooth using an electric mixer on low speed.
Gradually beat in the fat-free vanilla Greek yogurt, egg whites, lemon juice, vanilla extract, and all-purpose flour until just combined. Be careful not to overbeat.
Pour the cheesecake filling evenly over the graham cracker crust.
Stir the strawberry jam until smooth. Drop small spoonfuls of jam over the surface of the cheesecake filling.
Using a knife or a toothpick, gently swirl the jam through the filling to create a marble effect.
Bake for 25 to 30 minutes, or until the center is almost set. The edges should be slightly puffed.
Remove from oven and let cool to room temperature. Then, chill in the refrigerator for at least a few hours before serving.
Notes
This lightened-up cheesecake offers a delicious treat without the heaviness of traditional versions. Adjust the amount of jam swirled for your desired intensity of strawberry flavor.