Cookie Monster Cookie Recipe: Blue Sugar Cookies with Chips and Oreos

By Aquarium Guides Editorial Team · Updated November 10, 2026

Last Updated: November 10, 2026

Cookie Monster cookies are bright blue, thick sugar cookies loaded with chocolate chips and crushed sandwich cookies. They are fun for birthdays, themed parties, and kids’ baking projects. This recipe makes about 20 large cookies, keeps the dough thick enough that the blue color stays vivid, and explains how to get the shade right without a bitter dye taste.

Getting the Blue Right

Cookie dough starts out cream or pale yellow, so blue food coloring turns it greenish if you use too little or the wrong shade. Use gel food coloring rather than liquid, since gel is concentrated and does not add extra moisture. Royal blue gel works best. Mixing it into the butter and sugar before adding flour distributes it evenly. The dough will look slightly darker than the baked cookie.

Ingredients

• 2 1/2 cups all-purpose flour
• 1 teaspoon cornstarch
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 3/4 cup (1 1/2 sticks) unsalted butter, softened
• 3/4 cup granulated sugar
• 1/2 cup packed light brown sugar
• 1 large egg, plus 1 egg yolk
• 2 teaspoons vanilla extract
• 1/2 teaspoon almond extract (optional)
• 1/2 to 1 teaspoon royal blue gel food coloring, as needed
• 1 cup semisweet chocolate chips
• 1 cup coarsely crushed chocolate sandwich cookies (about 8 cookies)
• 1/2 cup mini chocolate chips or candy-coated chocolate pieces for pressing on top (optional)

Instructions

1. Whisk the flour, cornstarch, baking soda, and salt together.
2. In a large bowl, beat the butter with both sugars for 2 minutes, until pale and fluffy.
3. Add the egg, yolk, vanilla, and almond extract. Beat until smooth.
4. Add the blue gel coloring a little at a time and mix until the color is uniform and a bit deeper than you want in the final cookie.
5. Stir in the dry ingredients on low just until combined.
6. Fold in the chocolate chips and crushed cookies.
7. Cover and chill the dough for 30 to 60 minutes.
8. Heat the oven to 350°F and line two baking sheets with parchment.
9. Scoop 3-tablespoon portions of dough, roll into tall balls, and place 3 inches apart. Press extra chips and cookie chunks into the tops.
10. Bake 11 to 13 minutes, until the edges are set and the tops look matte. The centers should look slightly soft.
11. Cool for 10 minutes on the baking sheet, then transfer to a rack.

Tips

• Use gel coloring. Liquid food coloring is weaker and thins the dough.
• Mix coloring early. Add it before the flour so you can see the true shade.
• Do not overbake. Browned edges turn the blue muddy. Pull the cookies as soon as the edges are set.
• Chop the cookies roughly. Large chunks keep their texture. Fine crumbs turn the dough gray.
• Chill the dough. A cold dough ensures thicker cookies with a defined blue color.

Color Guide

Brands vary in strength, so add gradually. Start with a small amount, mix, and adjust.

Variations

Cookie Monster Bars

Press the dough into a lined 9×13-inch pan and bake at 350°F for 22 to 26 minutes.

Mini Cookies

Use 1 tablespoon portions and bake 8 to 9 minutes for party-sized cookies.

Googly Eyes

Press candy eyes onto the warm cookies immediately after baking. Use edible candy eyes only.

Cookie Dough Version

Use heat-treated flour and omit the eggs for safe-to-eat dough with the same flavor, then add a splash of milk to bring it together.

Vanilla Sugar Cookie Base

Omit the sandwich cookies for a simple blue sugar cookie and use white chocolate chips instead of semisweet.

Storage

Keep the cookies in an airtight container at room temperature for up to 4 days, with parchment between layers to prevent color transfer. Freeze baked cookies in a sealed bag for up to 3 months. Unbaked dough balls freeze well for up to 3 months and can be baked from frozen with 1 to 2 minutes extra. Store the cooled cookies out of direct sunlight, which can fade the blue over time.

Ingredient Notes

Gel Food Coloring

Gel colors are highly concentrated, so a small amount goes a long way. Brands differ in strength, and some blues lean toward teal or purple. Royal blue is the usual pick for this cookie.

Cornstarch

One teaspoon of cornstarch makes the cookie softer and thicker without altering the flavor.

Almond Extract

A small amount of almond extract gives a bakery-style sugar cookie flavor. Leave it out if you prefer plain vanilla.

Chocolate Sandwich Cookies

Chop them roughly with a knife or break them by hand. Pieces about the size of a pea or slightly larger keep the texture varied.

Troubleshooting

• Cookies spread too wide: The butter was too soft. Chill the dough longer.
• Color looks uneven: Mix the coloring in at an early stage and scrape the bowl well.
• Cookies are dry: They were baked too long. Take them out when the centers still look soft.
• Dough tastes bitter: That can come from too much gel dye. Use a smaller amount and accept a lighter shade.

Party Tips

For a themed party, bake the cookies a day ahead and add candy eyes just before serving. Set out a tray of milk in small glasses. For kids’ baking, let them roll dough balls and press on the toppings, but handle the oven and hot trays yourself.

Making Ahead for a Party

The dough can be mixed up to three days ahead and refrigerated in an airtight container. Scoop and bake straight from the refrigerator, adding a minute to the time. Baked cookies keep well for several days, so you can prepare them the day before the party and decorate with candy eyes shortly before serving. For larger gatherings, double the recipe and bake in rotation using two trays, keeping the rest of the dough chilled.

Decorating Ideas

Add a pair of candy eyes to each warm cookie, or pipe a small white dot on each eye with icing. Roll the dough balls in blue sanding sugar before baking for a sparkly finish. For a cleaner look, press mini chocolate chips in a pattern across the top just before the cookies go into the oven.

FAQ

Why is my dough green?

The butter and egg yolks give the dough a yellow base. Add a tiny drop of violet gel color to offset the yellow, or use more blue coloring.

Why did the color fade in the oven?

Overbaking and high heat dull bright colors. Lower the oven temperature by 15 degrees and bake only until the edges are set.

Can I use different sandwich cookies?

Yes. Any chocolate sandwich cookie works. Double-stuffed ones add more creaminess; regular ones give more crunch.

How do I keep the cookies thick?

Chill the dough, use cool butter, and shape the dough balls tall rather than flat.

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