A Bit of the Green – Key Lime Brownies


Key Lime Brownies | 2 Cookin Mamas Easy to make brownies starting with a mix and adding delicious tropical flavor with fresh key limes. #recipe #dessert

This is how we celebrate St. Patrick’s Day here in South Florida with Key Lime Brownies A little bit of the green from our Key Lime trees and a little bit of sweetness from some rich dark brownies. Of course, corned beef  is still on for the main course but there is always room for dessert.

Key Lime Brownie cut | 2 Cookin Mamas


This recipe is the perfect combination of tartness, sweetness and richness. OK, maybe it is a little over the top in richness, but who doesn’t like that? The brownies I used this time around were from a boxed Ghiradelli mix, awesome taste!, but I have made it with my gluten-free brownie recipe before and that comes out just as delicious. I decided to use my recipe for key lime pie filling but added a just a touch of cream cheese to blend better with the fudgy brownie. It was perfect! I also decided that it needed a little of that green color on the outside so it fit in with the St. Patrick’s Day theme so – in keeping with my South Florida roots, key lime cream cheese icing it was!

Key Lime Brownies closeup | 2 Cookin Mamas

And if you have never used the OXO Decorating Kit you are missing out. It is the perfect decorating tool for cupcakes, cookies, brownies and even things like deviled eggs, canapes and such. It is light and easy to use and clean up is a breeze. Learn more about it here.

Key Lime Brownies 1 | 2 Cookin Mamas

My husband brought them into work (his co-workers are so nice to be my guinea pigs) and they were a hit. Devoured in no time! Yay, success! So indulge today! They take hardly any time to whip up,especially when starting with a box mix, and they’ll be ready for a super after school snack or dinner dessert. Hope you enjoy!

Key Lime Brownies


  • Brownie Mix  (I used Ghiradelli Chocolate Supreme Brownie Mix) or try using our Gluten-Free Brownies

Ghiradelli brownie mix

  • ¼ cup water, 1/3 cup vegetable oil, 1 egg

Key Lime Filling

  • 2 egg yolks
  • 10 key limes, juiced (about 1/4 cup) (If you can’t find key limes I recommend Nellie and Joe’s Key West Lime Juice)
  • 3 Tablespoons softened cream cheese
  • ½ (14-oz) can sweetened condensed milk

Key Lime Cream Cheese Frosting

  • 3 tablespoons unsalted butter, room temperature
  • 4 ounces cream cheese, room temperature
  • 2 tablespoons key lime juice
  • ½ teaspoon key lime zest or lemon zest
  • 2 cups confectioner’s sugar


Preheat oven to 325 degrees. Lightly spray a 9×9-inch square baking dish with a nonstick spray.

Mix batter for brownies. Pour 2/3 of it into prepared dish.

In a medium sized bowl, combine egg yolks, key lime juice, cream cheese and sweetened condensed milk. Mix well. (Tint green if making for St. Patrick’s Day otherwise leave the traditional yellow color)

Pour or drop key lime batter over brownie mixture. Pour remaining brownie mixture on top, making sure to cover most of key lime batter. Swirl with a sharp knife.

Bake for 50-60 minutes or until a toothpick inserted in center comes out with just a slight amount of crumbs. Set on wire rack and let cool.

When cool (I suggest putting it in the refrigerator for about 1 hour), if not frosting entire top, turn out onto wooden cutting board. Cut into 16 squares. (Easiest to do if you run a sharp knife under very hot water, cut, wipe off blade, then cut again)

To make frosting, mix all ingredients in a small bowl and beat until smooth. Add a green tint with food coloring for St. Patrick’s Day or leave the more traditional yellow color for summer.

Decorate by either frosting the entire top or using a decorator’s kit with tips to pipe on top, like the OXO Good Grips Silicone Decorating Bottle Kit.

Makes 16 brownies.

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