Prepare the cake mix according to the package instructions. Line a 10x16 inch baking sheet with parchment paper and grease the sides of the pan with nonstick cooking spray.
Spread the cake batter evenly over the pan and bake in the preheated oven for 30 to 35 minutes, until a toothpick inserted into the center of the cake comes out clean.
Allow the cake to cool completely, then use a 2 ½ inch round cookie cutter to cut out the cake. Each jar will need three round pieces of cake.
To prepare the icing, beat together the cream cheese, vanilla extract, and butter until smooth and well combined. Add the powdered sugar and beat until smooth.
Place one cake round in the bottom of each jar.
Use a piping bag to pipe a layer of icing on top of the cake. Continue layering cake and icing until the jar is full. Repeat the process with the remaining jars.
Top each jar with sprinkles, if desired.
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