Blue chocolate chip cookies | Percy Jackson
Percy Jackson’s Blue Chocolate Chip Cookies
At Camp Half-Blood, Percy’s healing drink doesn’t taste like the apple juice it looks like. Instead, it tastes like his mom’s blue chocolate chip cookies. Like ambrosia, nectar will taste different for everyone. For Percy, the warm, buttery flavor is a taste of home that replenishes his energy and helps heal injuries. So I had to make Sally’s cookies!
I recoiled at the taste, because I was expecting apple juice. It wasn’t that at all. It was chocolate-chip cookies. Liquid cookies. And not just any cookies – my mom’s homemade blue chocolate-chip cookies, buttery and hot, with the chips still melting.
-Percy Jackson and the Lightning Thief, Rick Riordan
Tip: How to make bright vibrant blue chocolate chip cookies
Want that iconic Percy Jackson blue without dumping in a whole bottle of food dye? Here’s how to get vivid results using regular liquid food dye from the grocery store. No fancy gels needed!
Important: Don’t skip these steps—baking is chemistry, and this process is the secret to getting that bold color!
Step 1: Start the Color Early. After creaming your butter and sugars, mix in ½ teaspoon of liquid blue food dye. This begins the base color.
Step 2: Microwave Half the Dough. Scoop half the cookie dough into a glass, microwave-safe bowl. Microwave for 20 seconds on full power, stirring halfway through. This darkens the color slightly. If it still looks pale, microwave another 10 seconds—but avoid melting the butter!
Step 3: Mix It Back Together. Combine the microwaved dough back with the rest of the batch. Then add in the eggs.
Step 4: Add the Rest of the Color. Now mix in the remaining 2 teaspoons of liquid blue dye before adding the flour. The warm dough helps the dye distribute evenly and deepen into a vibrant blue, not turquoise or greenish.
Blue chocolate chip cookies | Percy Jackson
Ingredients
- 3/4 cup butter, room temperature
- 1/4 cup light brown sugar
- 1/2 cup granulated white sugar
- 2 large eggs room temperature
- 2 1/2 teaspoons liquid blue food dye divided
- 2 cups all-purpose flour
- 1 teaspoon sea salt
- 1 cup chocolate chips divided
Instructions
- **Make sure all ingredients are at room temperature.**
- Preheat oven to 355F (180C). If you have a fan-forced oven, set to 320F (160C).
- In the bowl of a stand mixer, on medium speed, cream together the butter, brown sugar and granulated sugar.
- Mix in 1/2 teaspoon blue liquid food dye. Scoop half the cookie dough into a glass microwaveable bowl and microwave on 100% power for 20 seconds, stirring half way. The colour of the dough should have darkened. If it hasn’t, heat for a further 10 seconds.
- Mix back into the remaining cookie dough. On medium speed, add the eggs and the remaining food dye and mix until combined.
- With the mixer still running, add the flour. If needed, turn off the mixer and scrape down the sides and bottom of the bowl with a rubber spatula to make sure the flour mixes in. Once the cookie dough is formed, pour in 3/4 cup chocolate chips and mix until combined.
- Use an ice cream scoop (or the equivalent of 2 heaped tablespoons) to scoop cookie dough onto a baking tray lined with parchment/baking paper, leaving 3″ (7.5cm) between cookie dough balls. Do not press the cookie dough down, they will flatten as they heat.
- Press the remaining chocolate chips onto the top of each cookie dough ball before placing tray in the oven. Bake for 20 minutes.
- Remove the tray from the oven and let them cool for 5 minutes before transferring cookies to a cooling rack for another 5 minutes.
Notes
FAQs
Don’t I need baking/bicarb soda?
Drop cookies (like these) don’t need baking soda. Which is great if you find you’ve run out! However, make sure you leave the cookie dough as a ball on the baking tray. Don’t press them down, as they’ll naturally flatten as they bake. They will be soft and chewy in the middle. If you prefer a more structured crumbed cookie, sift in 1/2 teaspoon baking soda with the flour before adding to the mixture, and gently flatten the cookie dough with a fork when on the baking tray.
From the archives
This recipe was originally created in 2018 and underwent a significant update six years later, with refreshed writing and newly reshot photographs. Instead of discarding the past, I’ve chosen to preserve an archive of the original photos of this recipe. Perhaps this little corner serves as a reminder for me, a reflection of all that this blog has taught me. And perhaps it’s for you too. We begin simply by picking up the camera and starting. And one day we look back and realise how far we’ve shuffled forward.
Hey, is there supposed to be baking soda or powder in these? I want to make, but found it strange that wasn’t on the list! Thanks :)
Hi Laura, you’re reading correctly, I didn’t put baking soda or powder in these. How you like your chocolate chip cookie, I’ve found, is a very personal thing. If you want a fluffier cookie, feel free to add. However, this recipe is for a denser cookie.
Just wondering, how many cookies does this recipe make? In the video, it shows 4 cookies, but it’s not actually listed anywhere.
Thanks in advance! :)
It yields 12 (It’s where the cooking time and prep time is)
meaning it makes 12 cookies
It really depends on the size. I made smaller ones and I baked 33
I wanna try it thanks for sharing
You look a lot like Sally Jackson!
I added a bit of vanilla extract and cinnamon and this was awesome!
I made it, really tasty, even though it turned out to be more mint green than blue
Yes, I got the same result，try adding a little more food color Gel , it’ll make it a bit more bluer
i love this recipe so much but i wanted to ask if you can tell me the amount of calories per serving
I am using this recipe for a school project I hope you’re fine with that.
Hi , thanks for the recipe, can you make more Percy Jackson themed recipes and post them, thank you 😊
i really want to try to make these for the pjo series premier thanks for the recipe :)
the dough was practically a liquid, it made about 9 cookies i use 3/4 of a bottle of food dye only for it to turn a nasty green/brown color it says it’ll take “40 minutes” it took that time JUST TO MAKE THE DOUGH I put them in the oven for 15 minutes, didn’t work, 20 minutes, didn’t work, 25, didn’t work, only after 30 MINUTES it was just cooked
Hi Kylie,
Yes that would make sense. Typically you only add a few drops of food colouring. If you add 3/4 of a bottle to the dough turning it to liquid, it increases the cook time as it needs more time for the moisture to evaporate. If you find yourself adding large amounts of food colouring to dough in the future and find the same situation, you’ll want to add more dry ingredients to counterbalance the liquid.
Unfortunately, food colouring brands are all different which would explain why your cookie colour turned out differently.
-B
Loved the cookies and they turned out great! However I feel like the dye amount is a bit too much? I added the 1/2 as said, then the 2 teaspoons and they turned out incredibly blue, more than the pictures you have. Still loved it, but I’m wondering if vanilla would change anything about it? Cause I plan on trying these again just with vanilla.
I did them and they did turn out a bit more green tho but they tasted fantastic, perfect for a PJO fan. Thanks for the recipe
A little bit of colour theory here!
If you add purple, then some blue it shouldn’t turn out green
THANK YOU! YOU’VE FED MY SPECIAL INTEREST IN THE BEST WAY!!
Does it work with margarine instead of butter? Or oil?
Great question!
For best results, I recommend sticking with butter. I tested the recipe using butter, which gives the right structure, flavour, and helps the cookies hold their shape.
Margarine can sometimes make cookies spread more and turn softer while oil wouldn’t be a direct substitute here, as it changes the texture quite a bit and can make the cookies greasy or flat.
If you do experiment, I’d love to hear how they turn out 😊
Literally the only blue cookie recipe I ever use. Always tastes AMAZING, and the colouring trick works perfectly for me! 10/10 will be bringing these to Camp Half Blood! 💙
didn’t turn out blue!! i used 12.5g of blue dye, great flavor though!! insted of chocolate chips you can use a bar of cooking chocolate and chop each peice into 6ths !
Hi there! I’m so glad you enjoyed the flavour 😊
If the cookies didn’t turn blue, it’s usually because the microwave step was skipped or shortened. That quick 20-second heating stage is what deepens the colour when using liquid food dye. Without it, the dough can stay pale or even shift slightly green/turquoise colours once baked.
Love your chocolate bar tip too. 🍪 Chopping a block works perfectly if you don’t have chips on hand. Thanks for sharing!
What if if i dont have a microwave, how can I head the ingredients?
If you don’t have a microwave, you can gently warm the half portion of dough in a small heatproof bowl set over a saucepan of barely simmering water (like a double boiler). Stir continuously and heat just until the colour deepens slightly. It should only take a minute or two as you don’t want it hot or cooked, just gently warmed to activate/deepen the blue.
Then mix it back into the remaining dough as directed 😊
Made these for my son’s Percy Jackson themed birthday party. I was very skeptical about the blue dye – I was sure the cookies would turn out green due to the yellow eggs and butter. But I followed the tips given in the recipe and they turned out amazing – “Cookie Monster blue” and very tasty! The only change I made to the recipe was to make smaller cookies (I used a small cookie scoop, about 1 heaping tbsp) and I baked them for 10 min instead of 20 min. They turned out perfectly with slightly crisp edges and a soft center. My son is so excited to serve these to his friends! Now the challenge is keeping the kids away from them so we will have enough for the party! Thank you for this recipe!
Hi there i love this recipe as a 14 year old percy jackson fan