01 -
Turn the oven on to 350°F. Grease and line two half-sheet trays (18×13-inch) with parchment paper. Mix together the boxed cake mix, sugar, water, eggs, vanilla, and oil using a stand or hand mixer for about a minute. At medium speed, add in the flour, salt, and sour cream and blend until silky, about 2-3 minutes.
02 -
Spread the batter into the two pans evenly (the layers will be thin). Bake for 15 to 18 minutes, and make sure they're fully cooked through. Afterward, let them cool down for 30 minutes at room temp, then pop them in the fridge for 30-60 minutes.
03 -
Combine marshmallow fluff and butter, then beat on medium-high for about 1 minute until it's creamy. Add in powdered sugar, vanilla, salt, and 2 tablespoons heavy cream. Mix on medium speed, adding a bit more cream if needed to reach a smooth but spreadable texture.
04 -
Use a 3-inch heart cutter to cut 32 hearts out of the cooled cake layers. Spread a layer of filling on half of the hearts, and then sandwich them with the rest. Lay them on a pan lined with parchment and place in the freezer for an hour.
05 -
Microwave the almond bark in short 30-second bursts, stirring each time until it's fully melted. Add Crisco, mix until smooth, and save ½-1 cup of the white coating for later. Stir pink gel food color into the rest of the melted chocolate, and set it aside for 3-5 minutes to cool a bit.
06 -
Dip the frozen cakes into the pink-tinted chocolate, then place them on a cooling rack lined with parchment paper. Let the coating set for about 10 minutes, then drizzle the leftover white chocolate on top to create messy patterns.