5 from 1 vote

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


  • 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


  1. 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.
  2. Combine coconut oil and essential oil then stir into dry ingredients.
  3. Spray a few pumps of witch hazel until the mixture can hold its shape.
  4. 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.
  5. For the icing:
  6. 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.
  7. Pipe on top of bath bombs and immediately add sprinkles. Let frosting dry overnight before packaging.