close up of Millionaire Brownie Cake with ice cream on a white dish

Have you ever wondered what would happen if a brownie and a cookie came together in perfect harmony?  Me too…

I decided to try it and let me tell you, the heavens opened up, birds started singing, rainbows fell from the sky!  This is the kind of dessert that you dream about… the kind that makes your knees buckle a little bit.  This is the most deliciously rich brownie cake recipe…  so rich it couldn’t be called anything but Millionaire Brownie Cake!

To make this brownie recipe extra quick and easy, I’ve started with packaged cooked and brownie mixes and added a few simple staple ingredients!  You can use any flavor of cookie mix or brownie  mix to make this dessert, just make sure your brownie mix makes a 9×9 pan (or 8×8 pan) and isn’t the family size.   I baked mine about 32 minutes… a toothpick inserted in the cookie portion should come out clean, you want it just set and not over baked to keep it ooey gooey.

collage of Millionaire Brownie Cake topped with ice cream

Serve it up with a scoop of ice cream and some fudge sauce for an extra special dessert that your family will go crazy for!


Items you’ll need for this brownie cake recipe:

* Brownie Mix * Cookie Mix * 9×13 Pan *


Millionaire Brownie Cake with ice cream and echolocate sauce closeup
5 from 3 votes↑ Click stars to rate now!
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Millionaire Brownie Cake

Serve it up with a scoop of ice cream and some fudge sauce for an extra special dessert that your family will go crazy for!
Prep Time 10 minutes
Cook Time 35 minutes
Total Time 45 minutes
Servings 12 servings


  • chocolate chip cookie mix packet (17.5 oz)
  • brownie mix approx. 19.9 oz (Not family size, makes approx. 9x9 pan)
  • 3 tablespoons water divided
  • 4 eggs divided
  • cup butter divided


  • Preheat oven to 350°F. Generously grease a 9x13 pan.
  • Combine brownie mix, ⅓ cup butter, 2 tablespoons water, and 2 eggs in a bowl.
  • In a separate bowl, combine cookie mix, 2 eggs, 1 tablespoon water, and ⅓ cup butter.
  • Place cookie mix in 2 tablespoon heaps around the pan. Place brownie mix in the pan in between cookie mix.
  • Bake 30-35 minutes or just until set. Do not over bake. Serve warm with ice cream and chocolate sauce.
5 from 3 votes

Nutrition Information

Calories: 111 | Protein: 1g | Fat: 11g | Saturated Fat: 6g | Cholesterol: 81mg | Sodium: 111mg | Potassium: 23mg | Vitamin A: 395IU | Calcium: 11mg | Iron: 0.3mg

Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.

Course Dessert
Cuisine American

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Millionaire Brownie Cake collage, with ice cream and in the pan

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About the author

Holly is a wine and cheese lover, recipe creator, shopping enthusiast and self appointed foodie. Her greatest passion is creating in the kitchen and making deliciously comforting recipes for the everyday home cook!
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Recipe Rating


  1. Could you use homemade cookie mix and brownie mix in this recipe instead of store bought if the weights are similar?5 stars