1. Preheat your oven to 350°F. Line two 9×13 baking sheets with parchment paper.

2. In a large mixing bowl, combine the vanilla cake mix, flour, sugar, eggs, salt, milk, vegetable oil, sour cream, and vanilla extract. Mix until the batter is smooth and well-combined.

3. Spread the cake batter evenly onto the prepared baking sheets. Bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean. Allow the cakes to cool completely on a wire rack.

4. Using a 2-inch heart-shaped cookie cutter, carefully cut hearts out of the cooled cake layers.

5. In a medium bowl, beat the marshmallow creme, softened butter, powdered sugar, salt, vanilla, and heavy cream until light and fluffy.

6. Spread or pipe the whipped frosting center onto half of the heart-shaped cake pieces. Top with the remaining cake hearts to create sandwich-style cakes.

7. Melt the white chocolate candy melts and mix in a few drops of pink food coloring. Dip or spread the colored, melted chocolate over the assembled heart cakes. Allow the chocolate coating to set before serving.