Preheat oven to 350 degrees.
Line 9x13 baking dish with parchment paper or grease with cooking spray.
Mix cake mix and oats in a large bowl.
Add melted butter and stir until crumbly.
Press two-thirds of the mixture onto the bottom of the dish.
Beat cream cheese in a mixer bowl until light and creamy.
Add sweetened condensed milk, lemon juice and vanilla and continue mixing until smooth.
Pour over crust.
Combine cranberry sauce and cornstarch in a small bowl.
Spoon over cream cheese mixture and gently spread out.
Sprinkle white chocolate chips over tops of cranberry sauce.
Sprinkle remaining crumb mixture over the top and press down gently.
Bake for 35-40 minutes or until center iss set.
Cool on a wire rack.
Refrigerate and cut into bars before serving.