This Microwave Rainbow Fudge swirls with playful pops of fruity colour in every bite.  The fruity mini marshmallows peek through the creamy base like tiny gems.

This recipe yields about 36 pieces of decadent fudge.

Each square feels like a confetti celebration wrapped in smooth sweetness.

It’s a treat that looks like a party before you even taste it.

Each bite feels like a soft rainbow melting on your tongue.

Printable Recipe Card with a Full List of Ingredients and Instructions is Located at the Bottom of the Post.

Be sure to read through the entire post so that you don’t miss out on any important tips and tricks!

Before starting to cook Microwave Rainbow Fudge I  lined an 8 x 8 inch baking pan with tinfoil and sprayed it lightly with cooking spray.

Then I measured out the correct amount of white chocolate and added some sweetened condensed milk to a microwave safe container.

Then I placed the large Pyrex measuring cup in the microwave. I melted the contents on high for 1 minute.

After 1 minute I removed the mixture and gave a good stir before returning it to the microwave for 20 second intervals until the chocolate  was melted.

Once the chocolate had melted I stirred in some vanilla extract and a bit of salt.

Then I folded in some mini fruit flavoured marshmallows.

I made sure all the marshmallows were coated in the white chocolate.

Next I scraped the fudge into the prepared pan.  

I put the pan in the fridge to set for a couple of hours.

Once the fudge was hard I used the tinfoil to lift the fudge out of the pan. 

Then I used a sharp knife to cut it into squares.

The colourful marshmallows create a dreamy mosaic inside each slice.

Microwave Rainbow Fudge is a cheerful twist on classic fudge, perfect for celebrations.

Printable Recipe Card with a Full List of Ingredients and Instructions is Located at the Bottom of the Post.

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PRINTABLE VERSION OF THE RECIPE CAN BE FOUND AT THE BOTTOM OF THE PAGE

Ingredients You'll Need to Make this Microwave Rainbow Fudge:

• 18oz white chocolate chips
• 14oz sweetened condensed milk
• ⅛ teaspoon salt
• 1 ½ teaspoon vanilla extract
• 2 cups mini fruit flavoured marshmallows

How to Make Microwave Rainbow Fudge:

1. Line an 8 x 8 inch baking pan with tinfoil lightly sprayed with cooking spray.
2. Put the white chocolate in a large microwaveable bowl.
3. Add the sweetened condensed milk.
4. Place in the microwave and heat on high for 1 minute.
5. Remove chocolate from microwave and stir contents.
6. Return to microwave and continue heating for 20 second intervals until chocolate is melted.
7. Add the vanilla extract and salt. Stir to combine.
8. Fold in the marshmallows.
9. Scrape into the prepared pan. 
10. Place in fridge to set.  About 2 hours.
11. Use the tinfoil to left the fudge out of the pan.
12. Cut into squares.
13. Serve and enjoy!

FAQS:

How do I store microwave rainbow fudge?

You can keep your microwave rainbow fudge fresh and colourful with these simple storage tips:

Short-term storage (3–4 days):

• Store the fudge in an airtight container at room temperature.

• Place parchment or wax paper between layers to keep the pieces from sticking together.

• Keep it in a cool, dry spot away from sunlight so the fruity marshmallows don’t soften too much.

Longer storage (up to 2 weeks):

• Refrigerate the fudge in an airtight container.

• Let it sit at room temperature for a few minutes before serving so it returns to its soft, creamy texture.

Freezing (up to 2–3 months):

• Wrap the slab or individual pieces tightly in plastic wrap, then place them in a freezer-safe container or bag.

• Thaw in the fridge or on the counter before enjoying.

This keeps your colourful, fruity marshmallow fudge tasting fresh and looking gorgeous!