Mirror Cake Glaze - Step-by-Step Instructions for Perfect Mirror Glaze
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Mirror Cake Glaze Recipe

Mirror cake is a cake made with a mirror glaze that is so shiny that you can almost see your reflection in it! While this type of glaze works best on smooth mousse cakes, it can work on any cake.

Mirror Glaze Cake
If you are a beginning baker, I would suggest sticking with buttercream frosting for your cake decorating before trying mirror glaze. But, if you are more advanced and you’re up for a challenge, mirror glaze is a fun project to try.

What is a Mirror Cake

Mirror glaze is like fondant. You don’t make it because it tastes amazing; you make it because it creates a great look.

That being said, I didn’t flavor mine with any extracts or flavored oils, which would have helped to make it taste better. I also would like to try making dark chocolate or salted caramel mirror glaze. Those variations could definitely fix the flavor problem!

In terms of texture, it is a little gummy – like a cross between fruit leather and jello.

What You Need to Make Mirror Glaze

The key ingredients in mirror glaze are powdered gelatin and white chocolate.

Box of Knox gelatin
You’ll also need sweeteners. This recipe uses sweetened condensed milk, sugar, and light corn syrup.

Food coloring makes the glaze look pretty.

And, of course, you’ll need some cakes to decorate. For best results, freeze your cakes overnight. (The picture below is of my vanilla and strawberry mousse cake before it was glazed.)

Vanilla and Strawberry Mousse Layer Cake

How to Make Mirror Glaze

Bloom the Gelatin

Mirror glaze starts with blooming the gelatin. This step happens in any recipe that uses gelatin, such as my friend Virginie’s pomegranate dessert and my healthy frosting made from yogurt. Blooming lets the gelatin absorb water and swell a little. To properly bloom gelatin, sprinkle gelatin over water a little bit at a time, whisking to thoroughly combine. Tip: If you drop all of the gelatin in one place, you may end up with large gelatin clumps (not pretty!).

After mixing, let gelatin sit for 15 minutes to bloom (absorb the liquid).

Adding gelatin to water

Make the Glaze

Mix the bloomed gelatin with white chocolate and condensed milk and set aside.

In a small saucepan, boil water with sugar and corn syrup until it reaches 217 F. (I recommend you use a candy thermometer to get the temperature exactly right.)

Pour the boiled syrup mixture over the white chocolate mixture and let sit for a few minutes until the chocolate starts to melt.

pouring sugar syrup over white chocolate and gelatin
Then, use an immersion blender to blend until smooth. Be sure to keep the blender entirely submerged to avoid bubbles.

Blending mirror glaze with an immersion blender
Pour glaze through a fine sieve to make sure that it is super smooth and any clumps don’t make it into your final glaze.

pouring glaze through a sieve

Color the Glaze

Next, decide how many colors you would like to mix and separate the glaze into a different container for each color. Add food coloring to each vessel to create your desired colors.

Cover tightly with plastic wrap, pressing plastic wrap directly against the surface of each glaze, and cool to 95 F.

glaze with food coloring covered in plastic wrap

How to Glaze a Cake with Mirror Glaze

To glaze your cake, place two drinking glasses on top of a cookie sheet and set your frozen cakes on top of the glasses.

Slowly but generously, pour one color glaze over the cake, being careful to avoid getting air bubbles. Tip: You can pop any air bubbles with a toothpick, but you will have to work quickly.

Quickly, before the glaze fully hardens, pour any other colored glazes over the first one and gently mix colors however you’d like using an offset spatula.

Glazing a mirror cake

It doesn’t require two people, but It is fun to do with a friend!

Carefully pick up each cake up by using both palms and reaching under the cakes. To remove any glaze hanging down off the sides of the cakes, run a knife across the dangling glaze so that it sticks to the knife, and gently twirl the knife to remove. Place the cakes on serving plates.

Can You Use Extra Mirror Glaze?

To use the extra mirror glaze, heat it back up to 95 F in the microwave or set over a bowl of simmering water.

If not using immediately, store in an air-tight container in the refrigerator.

Tips for Mirror Cakes

  • They aren’t that hard to make. But, because the glaze hardens so quickly, if you pour and you aren’t happy with how it looks, you’re out of luck. I call this a high-risk/high-reward dessert. A mirror cake might not be the dessert you choose to make when your mother-in-law is coming over for dinner for the first time.
  • While it might look like you can cover a mirror glaze cake in plastic wrap to store it, don’t even think about it! I touched the glaze on my finished cake with a tiny bit of plastic wrap and when I lifted the wrap, it pulled the whole glaze off of the cake.
  • You can add mirror glaze to any kind of cake as long as you freeze the cake first, but the glaze works much better if the cake is smooth to begin with. If your cake is not smooth enough, you can always crumb coat it and smooth the frosting completely before freezing.
Mirror Glaze Cake

This is a vanilla cake that has been mirror glazed. It’s a little bit lumpy because the cake isn’t smooth. Mirror glaze works better on a mousse cake.

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Mirror Glaze Cake
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5 from 1 vote

Mirror Glaze Cake

How to make a mirror glaze cake.
Course Dessert
Cuisine American
Keyword mirror glaze, mirror glaze cake
Prep Time 20 minutes
Cook Time 20 minutes
Total Time 40 minutes
Servings 24 servings
Calories 162kcal
Author Stef

Ingredients

  • 20 grams powdered gelatin 3 packets
  • 270 grams water divided
  • 300 grams white chocolate I suggest Guittard or Ghirardelli. Nestle white chocolate chips are surprisingly hard to melt.
  • 200 grams sweetened condensed milk
  • 300 grams sugar
  • 150 grams corn syrup
  • Food coloring your choice of amount and colors
  • 2 small mousse cakes frozen overnight

Instructions

  • Sprinkle gelatin over 120 grams of water a little bit at a time, whisking to combine. Try not to drop a lot of gelatin in one place to avoid large clumps.
  • Let gelatin sit for 15 minutes to bloom (absorb the liquid).
  • In a medium-sized bowl, combine white chocolate, condensed milk, and bloomed gelatin.
  • In a small sauce pan, boil 150 grams of water with the sugar and corn syrup until it reaches 217 F.
  • Pour boiled mixture over the white chocolate mixture.
  • Let sit for a few minutes until chocolate starts to melt.
  • Use an immersion blender to blend until smooth, keeping the blender entirely submersed to avoid bubbles.
  • Pour glaze through a fine sieve and separate into as many vessels as you would like colors.
  • Add food coloring to each vessel to create your desired colors.
  • Cover tightly with plastic wrap, pressing plastic wrap directly against the surface of each glaze, and cool to 95 F.
  • Place two drinking glasses on top of a cookie sheet and set your frozen cakes on top of the glasses.
  • Slowly but generously, pour one color glaze over the cake, being careful to avoid getting air bubbles.
  • Quickly, before the glaze fully hardens, pour any other colored glazes over the first one and gently mix colors however you'd like using an offset spatula.
  • Carefully pick up each cake up by using both palms and reaching under the cakes. To remove any glaze hanging down off the sides of the cakes, run a knife across the dangling glaze so that it sticks to the knife, and gently twirl the knife to remove. Place the cakes on serving plates.
  • To use the extra mirror glaze, heat it back up to 95 F in the microwave or set over a bowl of simmering water. If not using immediately, store in an air-tight container in the refrigerator.

Video

Notes

I recommend that you use a candy thermometer with this recipe to make sure your temperatures are exact.
The glaze ingredients make enough to cover four small cakes, but I've written the instructions to cover two cakes. This is because you'll want far more glaze than you actually need so it can run down the cake without you worrying about running out.
Instead of covering the cake with each glaze color separately, you can also swirl the colors together slightly into one bowl and then pour the combined swirled glaze onto the cakes.
The nutrition facts are for the glaze only, as you can use it with any cake to make a mirror cake.
The glaze recipe is slightly adapted from Kara's Couture Cakes.

Nutrition

Nutrition Facts
Mirror Glaze Cake
Amount Per Serving
Calories 162 Calories from Fat 36
% Daily Value*
Fat 4g6%
Saturated Fat 2g10%
Cholesterol 5mg2%
Sodium 28mg1%
Potassium 66mg2%
Carbohydrates 29g10%
Sugar 29g32%
Protein 2g4%
Vitamin A 25IU1%
Vitamin C 0.2mg0%
Calcium 50mg5%
Iron 0.1mg1%
* Percent Daily Values are based on a 2000 calorie diet.
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