Big Giant Chocolate Sandwich Cookie (Homemade Oreo!)

This HUGE cookie is an Oreo-lovers dream! Super soft chocolate cookies are sandwiched with your choice of frosting. Buttercream and cream cheese frostings are both delicious favorites! This giant sandwich cookie (9-10″ wide!) is made from a shortcut of one boxed chocolate cake mix, just like this very popular Homemade Oreo recipe. Obviously these aren’t a copycat of crispy Oreo cookies, but this style of chocolate sandwich cookie is commonly referred to as a homemade oreo, so we call this a giant oreo!

giant homemade oreo

Ingredient and Equipment Notes

  • Chocolate Cake Mix – I always make this recipe with Duncan Hines brand devil’s food cake mix. You are welcome to use another brand of chocolate or devil’s food cake mix. It will most likely turn out just fine, but for best results you may want to use the same brand I do.
  • Butter – This recipe can be made with butter flavored shortening as well as vegetable oil in place of the butter. You may have slightly different results so feel free to try different options to see what you like best.


  1. Combine your dry cake mix with eggs and butter and beat until if forms a cohesive dough.
  2. Use my Circle Template placed under a piece of parchment to gently pat out the dough until it’s in a 6″ circle.
  3. Bake until you see crackly edges and top. Let cool and then slide parchment onto cooling rack. The cookies will be very soft and bendable so it’s important to let them cool completely before frosting!
  4. Whip up your frosting of choice. I’ve provided recipes for both buttercream and also a cream cheese frosting. Both are delicious! Spread onto the back side of one cookie and then sandwich the the second cookie.

You can break pieces off, go at it with two hands, slice into wedges like a pizza, or into squares like I have here. Since this is a sandwich cookie it’s extra rich and can really feed a crowd! But only if you want it to. No one has to know this isn’t meant to be a single-serving.

chopped homemade oreos

Frequently Asked Questions

Can I make this with a different cake mix flavor? Yes! This basic recipe for cake mix cookies works well with a variety of flavors. Feel free to mix and match cake mixes and frosting flavors for fun combinations.

Can I freeze this cookie? Yes. Freeze the cookies before filling by layering between sheets of parchment paper and sealing well. Or, freeze entire cookie, filled. To serve- let cookie come to room temperature (or don’t- it’s actually really good straight out of the freezer haha)

giant chocolate sandwich cookie

My favorite way to gift giant cookies are with blank pizza boxes. You can grab them on Amazon, or check your local restaurant supply store!

Giant homemade oreo in pizza box

If you make these, I’d love to see! Tag me on instagram (I’m @ourbestbites). We even have a fun community hashtag –> #OBBgiantcookie . Tag your photo to add to the collection!

Related Recipes

If you’re looking for more big giant cookies, you can find them all right here:

Big Giant Chocolate Chip Cookie

Big Giant Oatmeal Cookie

Big Giant Double Chocolate Fudge Cookie

Big Giant Sugar Cookie

Big Giant Chocolate Sugar Cookie

Big Giant Chocolate Crinkle Cookie

Big Giant Soft and Chewy Ginger Cookie

Big Giant Peanut Butter Cookie

Big Giant Snickerdoodle Cookie

Giant Peppermint Candy Cane Chocolate Chip Cookie

Giant Red Hot Sugar Cookie

Giant Chocolate Peppermint Bark Cookie

Giant Chocolate Cadbury Egg Cookie

hands holding a giant chocolate cookie

Giant Chocolate Sandwich Cookie

This giant sandwich cookie is reminiscent of a soft homemade Oreo. Big enough to make you swoon! Choose between a buttercream or cream cheese frosting.
Prep Time 10 minutes
Cook Time 15 minutes
Extra Pre-Heating Time 15 minutes
Total Time 40 minutes
Servings1 10" cookie




  • 15.2 ounce box devil's food cake mix I recommend Duncan Hines
  • ½ cup butter, softened butter flavored shortening or oil also works
  • 2 eggs

Buttercream Frosting

  • ½ cup real butter
  • 2 cups powdered sugar
  • 1 teaspoon vanilla
  • 1 generous pinch salt
  • 1 + tablespoons milk or enough to reach desired consistency

Cream Cheese Frosting

  • 3 ounces cream cheese
  • 2 tablespoons butter
  • 2 cups powdered sugar
  • 1 pinch salt
  • 1 + tablespoons milk or enough to reach desired consistency


  • Preheat oven to 350 degrees.  Tip: After your oven signals it's pre-heated, wait an extra 10-15 minutes if possible before placing food in.
  • Combine butter and eggs with dry cake mix (ignore all instructions on box) with a hand mixer or stand mixer until a cohesive dough forms. Butter should be very soft, it's even okay if you soften in the microwave and it's just a bit melted.
  • Divide dough into equal parts- I recommend a food scale to accurately divide.
  • Form each portion of dough into a round ball.  Print off my template guide and place it on a baking sheet.  Place a sheet of parchment paper over the template guide.  Pat dough evenly into circle shape following the guide for a 6" circle. *You are making 2 cookies. If you have a jumbo baking sheet you might be able to fit them both on, otherwise, use 2 separate cookie sheets or bake one and then bake the other. 
  • Bake each cookie for 12-15 minutes.  You'll be looking for cracking on the edges and moving into the center of the cookie. This is a good signal the cookie is ready.  Remove pan from oven and let cool on the counter until cool enough to touch.  Slide parchment onto a cooling rack. Wait until cookie is completely cool before filling.
  • To prepare filling, choose buttercream or cream cheese icing and beat all ingredients until smooth.  Add milk one teaspoon at a time until frosting is fluffy and soft as desired.


  • Nutritional value is for the entire cookie, and was calculated using buttercream frosting.


Calories: 4552kcal, Carbohydrates: 556g, Protein: 39g, Fat: 260g, Saturated Fat: 134g, Polyunsaturated Fat: 30g, Monounsaturated Fat: 78g, Trans Fat: 7g, Cholesterol: 817mg, Sodium: 5538mg, Potassium: 1631mg, Fiber: 10g, Sugar: 401g, Vitamin A: 6185IU, Calcium: 772mg, Iron: 21mg
Course: Desserts
Cuisine: American
Keyword: giant cookie, homemade Oreos
Calories: 4552kcal
Author: Sara Wells
Cost: $5
Did You Make This Recipe?Snap a picture, and hashtag it #ourbestbites. We love to see your creations on our Instagram @ourbestbites!
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Meet The Author

Sara Wells

Sara Wells co-founded Our Best Bites in 2008. She is the author of three Bestselling Cook Books, Best Bites: 150 Family Favorite RecipesSavoring the Seasons with Our Best Bites, and 400 Calories or Less from Our Best Bites. Sara’s work has been featured in many local and national news outlets and publications such as Parenting MagazineBetter Homes & GardensFine CookingThe Rachel Ray Show and the New York Times.

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