1. Preheat your oven to 350 degrees F.
2. Line a cupcake or muffin pan with cupcake liners and set aside.
3. In the bowl of a stand mixer, combine the cake mix, eggs, buttermilk, and water.
4. Mix on medium to high speed until fully combined.
5. Add the strawberry jam and mix again until incorporated.
6. Using a large ice cream scoop, fill each cupcake liner about ¾ full with batter.
7. Bake for 14–16 minutes or until a toothpick inserted into the center comes out clean.
8. Remove from the oven and allow the cupcakes to cool completely.

Make the Frosting

1. In the bowl of a stand mixer, add the cream cheese, powdered sugar, butter, and vanilla extract.
2. Mix on medium to high speed until smooth and creamy.
3. Frost each cooled cupcake.
4. Top with a small spoonful of strawberry jam and garnish with sliced fresh strawberries if desired.