A unique calorie-free treat that looks good enough to eat, these DIY Cupcake Bath Bombs feature a fizzy bath bomb base and whipped soap “frosting” that will leave you smelling absolutely delicious.

DIY Cupcake Bath Bomb Craft

Donut bath bombs, candy apple bath bombs, cotton candy bath bombs, sour candy bath bombs, taco bath bombs… if you’re sensing a theme to our DIY bath bomb recipes, you’d be right!

For some reason, I can’t resist adding scrumptious scents to our homemade bath bombs and making them into unique food-inspired shapes. Maybe because my life revolves around food and recipe development, it just creeps into everything that I do.

But I’d hardly call that a bad thing! Case in point: scrumptiously cute cupcake bath bombs. Perfect for indulging in late at night – without the calories – or gifting to a friend as a unique treat.

These bath bombs work double-time: the bottom “cake” part is a fizzy bath bomb gently scented with a pink champagne oil while the “frosting” is actually a whipped raspberry-scented soap that you can either crumble up to dissolve in your bath or scrub with – your choice.

I decided to go with a raspberry and pink champagne scent to give these cupcakes a celebratory feel that is perfect for birthdays or anytime you feel like indulging. Of course, you can stick with a traditional bakery-inspired scent, if desired.

Typically, a store-bought bath bomb will run you $5+ and buying all of the ingredients for bath bombs will initially cost probably about $25 if you have none of the ingredients on hands. However, that $25 is enough to make easily 100+ bath bombs – and you can use many of these materials in different ways:

• Epsom salts can be used to make custom bath soaks, or just sprinkle it as-is in the bath after a work out or stressful day
• Citric Acid is a food additive that can be used in DIY cleaners, canning food, or you can make your own fizzy sherbet with it (it’s also used in home brewing!)
• Corn Starch is a great thickener used for sauces like gravy or with mac and cheese, or you can make oobleck with it (a fun sensory play material)
• Baking Soda is great for cleaning, is used often in baking, and you can make fun fizzy science experiments with it
• Coconut Oil is an awesome substitute for butter or oil in baking/cooking, and there are lots of holistic ways it can be used (I used to actually massage and wash my face with it when I had  some post-partum pimples and we often add it to our homemade sugar scrubs)

Check out our quick video to see how easy these birthday cupcake bath bombs are to make and then don’t forget to scroll down to grab your free printable recipe card:

More Unique Bath Bomb Recipes:

• Donut Bath Bombs
• Cotton Candy Bath Bombs
• Glow in the Dark Bath Bombs
• Starry Night Bath Bombs
• Taco Bath Bombs

Cupcake Bath Bomb Ingredients

Bath Bomb Ingredients:

• Baking soda
• Citric acid
• Cornstarch
• Cream of Tartar
• Epsom salts
• Coconut oil 
• Avocado Butter
• Polysorbate 80
• Pink Champagne Fragrance Oil
• Light Pink Mica Coloring
• Cosmetic glitter <– I mixed two colors together; Downtown Disguise and Silver Promise)

For the Whipped Soap Frosting:

• White Whipped Soap Base
• Raspberry Fragrance Oil
• Glycerin
• Polysorbate 80
• Cornstarch
• White Melt and Pour Soap Base
• Pink Soap Coloring <– can use mica or liquid soap coloring

Scroll down to the printable recipe card for full measurements.

Tip: because different brands will vary in terms of moisture and texture and where you store your bath bomb ingredients can effect how they work in this recipe, use our measurements as a guide and rely on texture clues in your bath bomb mixture to achieve the perfect mix.

Kitchen Tools You May Find Helpful

• Measuring Cups and Spoons
• Cupcake Tin
• Cupcake Liners
• Mixing Bowl
• Whisk
• Piping Bag with a Large Star Tip
• Spray bottle filled with rubbing alcohol
• Dry glitter sprayer, optional

How to Make Cupcake Bath Bombs

For the Bath Bomb Base:

Line a cupcake tray with cupcake liners. Set aside.

In a large mixing bowl, whisk together the baking soda, citric acid, cornstarch, cream of tartar and Epsom salts.

Measure out the coconut oil into a liquid measuring cup and stir in the pink champagne oil, avocado butter and polysorbate 80.

Whisk the coconut oil mixture into the dry mixture.

The mixture is perfect when it holds together when you press it into your hands and feels like wet sand.

Whisk in the mica color powder and glitter.

Press the bath bomb mixture into the prepared cupcake liners.

For the Whipped Soap Frosting:

Place the whipped soap base, polysorbate 80 and gylcerin in a mixing bowl. With an electric mixer, beat on low speed until fluffy, about 1 minute.

Fold the cornstarch in with a spatula and mix on low for 30 seconds.

Place the melt and pour soap base in a microwave-safe bowl and melt for 30 seconds. Stir well and reheat as needed until completely melted. Allow to cool for about a minute.

Stir the raspberry oil and soap coloring into the melted soap.

Drizzle the melted soap mixture into the whipped soap mixture and beat on high speed for 1 minute, until the mixture forms stiff peaks.

If needed, add more cornstarch to help the soap reach a firm consistency.

Scoop the whipped soap mixture into a piping bag.

Swirl the soap frosting onto the cupcakes. Start in the middle of the cupcake and apply gentle pressure on the piping bag as you make small, controlled circles with your wrist. Flick your wrist slightly to stop the stream of frosting.

Sprinkle with glitter, if desired.

Allow soap to harden for 2-3 days before removing the bath bombs from cupcake tin.

Store in an airtight container until ready to enjoy.

Pin this Pink Champagne Bath Bomb for a unique spa night indulgence:

Grab your free printable recipe card for our DIY Cupcake Bath Bomb with Whipped Soap Frosting:

I hope you love indulging in these delicious-smelling cupcake bath bombs. Feel free to swap out the scents and colors to make them your own!

For more DIY Beauty Ideas, check out our full DIY Beauty Crafts collection here:

For more Homemade Gift Ideas, check out our full Homemade Gift collection here: