This instructable will teach you how to make heart shaped cupcakes with standard cupcake pans. I got this idea from a mother whose child was in my oldest daughter's preschool class. We've been making this every Valentine's Day since.
Step 1: Get The Stuff
cake batter (one box prepared according to package instructions)
colored sprinkles (optional)
Step 2: Filling The Pans
Place liners in your pan(s). Fill with cake batter 1/2 full. Do not overfill!
Place a marble between the pan and the lining paper. This creates an indentation in the baked cupcakes that is the top of the heart shape. Bake as usual.
Step 3: Cool
Once they are baked, allow the cupcakes to cool at room temperature. The marbles will be quite hot so don't take the cupcakes out until they are cooled or you are prepared to handle the hot marbles. It is best just to wait it out.
Step 4: Frost
Part of the heart-shaped illusion is the frosting method. Take advantage of the indented part of the cupcake and spread your icing into two arches so it looks like the top part of the heart. At the point directly opposite of this, spread the icing to accentuate the look of a point. The best way to do this is to not spread to the edges of the cupcake top except where the arches and points are meant to go.
Cover with colored sprinkles, if desired.