much like the Jell-O instant pudding mixes and cups you can find in the grocery store. Meanwhile, chocolate mousse is light and airy — think of it like whipped cream's chocolate cousin.

"Cornstarch or agar-agar are my preferred substitutes for gelatin," she says. "Both work well to create a mousse ... achieve a pudding-like texture. Read more: We Taste Tested 10 Chocolate Sauce ...