01 -
Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
02 -
In a medium bowl, whisk together flour, salt, cocoa powder, baking powder, and baking soda.
03 -
In a large bowl, beat softened butter, granulated sugar, and brown sugar until light and fluffy.
04 -
Beat in the egg and vanilla extract until fully incorporated.
05 -
Add red food coloring, then alternate mixing in the flour mixture and buttermilk, beginning and ending with dry ingredients, until a smooth batter forms.
06 -
Transfer batter to a piping bag and pipe heart shapes onto prepared baking sheets, spacing evenly apart.
07 -
Bake in preheated oven for 10 to 12 minutes, or until tops are set. Allow to cool completely on a wire rack.
08 -
In a medium bowl, beat cream cheese and butter until smooth. Add powdered sugar gradually and vanilla extract; mix until a fluffy, spreadable consistency is achieved.
09 -
Spread or pipe filling onto the flat side of half the cooled cakes. Top with remaining halves to form sandwiches.