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DIY Cupcake Bath Bombs

DIY Cupcake Bath Bombs – how to make a cupcake bath bomb with royal icing and sprinkles. This essential oil bath bomb makes a great handmade birthday gift!
Servings 6
Author Crystal


  • 1 cup baking soda
  • ½ cup citric acid
  • ½ cup cornstarch
  • 3 tablespoons epsom salt
  • Pigment powder or gel food coloring
  • 3 tablespoons coconut oil melted
  • 15-20 drops essential oil
  • For the royal icing:
  • 3 tablespoons meringue powder
  • 4 cups powdered sugar
  • 5-6 tablespoons warm water


  • In a large bowl, combine baking soda, citric acid, cornstarch, epsom salt and a small amount of cosmetic pigment powder (less than a tablespoon) or a few drops of gel food coloring.
  • Combine coconut oil and essential oil then stir into dry ingredients.
  • Spray a few pumps of witch hazel until the mixture can hold its shape.
  • Firmly press into silicone baking cup. Let bath bomb dry overnight before gently removing from baking cup. Tip: lay a soft towel down to gently drop the cupcakes on.
  • For the icing:
  • Combine meringue powder, powdered sugar and warm water in a stand mixer. Beat for 7-10 minutes or until icing is stiff. Add half a tablespoon of water at a time, if needed.
  • Pipe on top of bath bombs and immediately add sprinkles. Let frosting dry overnight before packaging.