It's easy to create light blue, medium blue, or bright blue Rice Krispie Treats using varying amounts or types of blue food coloring. These no-bake desserts are perfect for team parties, school bake sales, or baby showers.
Whether you want to make baby blue rice crispy treats or dark or royal blue treats, you can do so by simply adding blue food coloring to our Best Rice Krispie Treat recipe.
You can use a grocery store variety of liquid food coloring or gel icing colors. Either works fine.
The trick is knowing when to add the coloring and how much coloring to use to get the desired shade of blue.
Keep reading and I'll show you how to make a variety of blue Rice Krispie Treats.
- Rice Krispies Cereal - We always recommend using Kellogg's Rice Krispies as they will give your treats the best texture.
- butter - We recommend using salted European-style butter (with a higher butterfat content than American-made butter) for the very best flavor. See our taste test results for more information.
- marshmallows - We like to use Kraft Jet-Puffed Marshmallows because they produce perfectly chewy treats.
Some store-brand marshmallows are very sticky once melted and are difficult to blend with the crisp rice cereal. If you do use them, you may need to add up to an extra cup of cereal.
You can use mini or large marshmallows. See our marshmallow conversion chart for details about measuring marshmallows.
- blue food coloring - You can use grocery store-variety liquid food coloring like McCormick Food Coloring or you can use gel or paste icing coloring like AmeriColor or Wilton.
See the recipe card for quantities.
- extra-large mixing bowl - You want to use a bowl that allows you room to mix the cereal and marshmallows together.
- medium-large (3 or 4-quart) saucepan - I like using a non-stick pan so the marshmallows don't stick too badly.
- 9x13-inch baking pan - If you use a non-stick pan and grease it with butter, the treats will easily slide out of the pan. If you use a glass pan or aluminum pan, you might want to line it with parchment paper or non-stick tin foil.
- silicone spatula - If you grease a silicone spatula (or Spoonula) with butter or baking spray, the cereal treat mixture won't stick. You can also use a wooden spoon but I'd grease it too.
- optional, zip-top bag or disposable pastry bag - Use this or a spoon to drizzle the white chocolate over your treats.
Follow the directions below to make blue-colored cereal treats.
Cut the butter into thin slices and place them in a medium-large saucepan. Set it over LOW heat.
Allow the butter to begin to melt then pour marshmallows over the top.
Stir often until about 75% of the marshmallows have melted. I like using mini marshmallows as they melt more quickly than large ones.
Remove the pan from the heat at this point so the marshmallows don't get too hot. You do not want your marshmallows to get too hot.
Stir until the marshmallows completely melt.
Add a few drops of blue food coloring and stir until blended.
If the color is not bright enough for you, add a few more drops of coloring. If you like this color, stop now and mix this into your cereal.
Add more color if desired. You want this to look brighter than the final color as the cereal will dull this color once mixed in.
It's always best to add a few drops of food coloring at a time to the marshmallows. You can always add more but you cannot lighten the color if it gets too bright. For the baby blue Rice Krispie Treats, use 3-6 drops of liquid blue coloring or 6-8 drops of baby blue gel coloring.
Just note that Rice Krispies Cereal has a slight yellow color which can affect the final color of your treats. You'll notice the blue cereal treats look slightly green (yellow + blue = green). If you prefer your treats to have a truer blue color, add a small drop of purple to the marshmallows.
If you want your treats to be darker or brighter blue, add more coloring.
Stir the coloring in until it's well blended with the marshmallows.
The more coloring you add, the deeper the color will become.
Pour the blue marshmallows over the bowl of Rice Krispies Cereal.
Stir until the blue is completely coating the pieces of cereal.
Then, gently press the cereal treat mixture into a greased square pan.
You can see the variety of blue colors that can be made just by adjusting the number of drops of food coloring you add. If you use gel icing coloring, you can achieve even more variety of colors like sky blue, royal blue, navy blue, etc.
You can swap out coconut oil for the butter and use vegan marshmallows and vegan and gluten-free crisp rice cereal to make vegan and gluten-free cereal treats.
Once you've made a batch of blue rice crispy treats, you can use them to make something fun like these Rice Krispie Treat Easter Eggs.
Or, these colorful Rainbow Rice Krispie Treats that are made with layers of indigo, blue, green, yellow, orange, and red crispy treats.
If you prefer, you can always make traditional Rice Krispie Treats and then add frosting on top. I used a variety of blue, white, and black frosting to make these cool Galaxy Rice Krispie Treats.
Do not overheat your marshmallows! The sugar in the marshmallows will caramelize when heated too much and this will cause your treats to be hard.
Also, do not smash the cereal into the baking pan or you will compact the treats too much which will also make hard treats.
Store these treats in an airtight container at room temperature for up to 5 days.
To keep them longer, you can freeze them in an airtight container or zip-top bag for up to 3 months.
If you'd like to make other colored treats, be sure to check out these recipes.
Blue Rice Krispie Treats
- 4 ⅔ cups Rice Krispies Cereal
- 4 tablespoons salted butter (European-style for the best flavor)
- 10 ounces marshmallows
- 3-20 drops blue food coloring
- Grease an 8-inch or 9-inch square non-stick baking pan, an extra-large mixing bowl, and a silicone spatula or wooden spoon with butter or baking spray.
- Pour the Rice Krispies Cereal into the mixing bowl and then set aside.
- Cut the butter into slices and place them in a medium-large saucepan.
- Set the pan on the stove set over LOW heat.
- Allow the butter to begin melting and then pour marshmallows on top.
- Stir every few minutes until about 75% of the marshmallows have melted. This will take between 5-7 minutes.
- Remove the pan from the heat and stir the marshmallows until completely melted. The residual heat in the pan will help to continue melting the marshmallows.
- Alternatively, you can melt the marshmallows and butter in your microwave. Pour the butter and marshmallows into a microwave-safe mixing bowl. Heat on high power for 1 minute then let the bowl rest in the warm microwave for 3 minutes. Remove the bowl and stir until the butter and marshmallows are melted and smooth.If needed, heat for additional 10-second bursts of high power, resting and stirring after each until melted.
- Do not overheat your marshmallows or your marshmallow cereal treats will be too hard!
- Add a few drops of blue food coloring and mix until well blended.
- Continue adding more drops of blue coloring until you achieve the desired shade of blue. The blue-colored marshmallows need to be a little brighter than you want your treats to be because the cereal will dull the color.
- Pour the blue marshmallows over the cereal and stir until they are well blended.
- Gently spread the cereal treat mixture into an even layer in the greased pan.
- Set the pan of treats aside for at least 30 minutes before cutting into 12 rectangles or 16 squares.
- Serve and enjoy!
CaloriesThe Calories listed are for 12 rectangle treats. If you cut the treats into 16 squares, they'll be 115 calories.
TipsUse European-style salted butter for the very best flavor.
Do not overheat the marshmallows or your treats will be too hard.
StorageStore your treats in an airtight container for up to 5 days or freeze them in a zip-top bag for up to 3 months.
Large Batch IngredientsIf you want to make a larger batch of yellow Rice Krispie treats, follow the instructions above using this list of ingredients. Spread the mixture into a 9x13-inch pan.
- 7 cups Rice Krispies Cereal
- 6 tablespoons salted butter
- 16 ounces marshmallows
- blue food coloring