It was from a cookbook called Nestle Classic Recipes. The recipe is called "No-Bake Chocolate Cheesecake Pie" (p. 89). I modified the recipe to fit my 7" heart pan, from the 9" round pan size they provided. It fit beautifully! Rather than a whipped cream topping, I went with strawberry slices. This was a delicious, thick cheesecake! I only needed a small piece to be satisfied. Yummy and super easy.
Happy Valentine's Day!