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Home » Recipes » Dessert Recipes

Birthday Brownies


Prep Time :5 minutes mins
Cook Time :40 minutes mins
Total Time :1 hour hr 15 minutes mins
Servings :9
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a close up of a stack of birthday brownies, three of them, with a set of happy birthday candles in the background
a stack of birthday brownies with buttermilk frosting with sprinkles with happy birthday candles in the background

Published: Mar 22, 2023 · Modified: Oct 25, 2024 by Melanie Cagle · Leave a Comment

Who doesn't love a simple birthday cake idea, one that everyone adores and is a classic favorite? Birthday brownies are our new family favorite.

a stack of 3 birthday brownies, with frosting. A set of happy birthday candles in the background.
Birthday Brownies

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You could even give this birthday brownie as a gift - just invest in a classic gift box that will fit the brownie slab and decorate it in the box.

Jump to:
  • What makes this recipe so yummy
  • Groceries you'll need: Ingredients
  • Recipe walkthrough: Instructions
  • Recipe variations and substitute ideas
  • Necessary gear: Equipment
  • How to store leftovers
  • Mel's kitchen notes
  • More great brownie recipes I think you'll love
  • Birthday Brownies
  • 💬 Comments

What makes this recipe so yummy

  • This is a great way to make a birthday cake that everyone loves - brownies are the best! These gourmet brownies are delicious and can be decorated so easily.
  • Brownies are super quick, so mix those ingredients, get it baking and have a birthday cake in less than an hour!

Groceries you'll need: Ingredients

ingredients all laid out for what you'll need to make birthday brownies
  • Sugar
  • Flour
  • Cocoa
  • Powdered Sugar
  • Semi-Sweet Chocolate Chips
  • Salt
  • Eggs
  • Butter
  • Oil
  • Vanilla Extract
  • Milk
  • Sprinkles

See recipe card at the bottom of this post for quantities.

Recipe walkthrough: Instructions

This is an overview of the recipe steps. For more detailed instructions visit the recipe card at the bottom of this post.

a collage of four images showing how to make birthday brownies
  • Step 1: Add the Sugar, Flour, Cocoa, Powdered Sugar, Salt and chocolate chips to a medium mixing bowl and mix together well.
  • Step 2: Add the Eggs, Melted Butter, oil and vanilla to another mixing bowl and mix together.
  • Step 3: Add the dry ingredients to the wet ingredients and stir carefully, being careful not to overmix.
  • Step 4: Pour batter to a greased 8x8" baking pan lined with greased parchment paper and bake at 325°F for 40 minutes.
a collage of four images showing how to make birthday brownies
  • Step 5: Add the softened butter to a medium mixing bowl and beat until creamy.
  • Step 6: Add the powdered sugar, in batches so as not to make too much mess. Add the Vanilla and milk. Beat until frosting is at preferred consistency.
  • Step 7: Spread onto the cooled brownie square.
  • Step 8: Cover the buttermilk frosting with sprinkles of your choice.

Hint: Allow the brownies to cool completely before adding the frosting or you might find the frosting get too soft.

Recipe variations and substitute ideas

  • White Chocolate - instead of the semi-sweet chocolate chips you could use white chocolate.
  • Brownie Mix - Instead of making these brownies from scratch like this, save some time and use a brownie mix.
  • Milk Chocolate Chips - Use milk chocolate chips instead of semi-sweet chips.
  • Heavy Cream - use heavy cream in the frosting, instead of milk.
  • Skim Milk - use skimmed milk in the frosting instead of milk.
  • Vegan Milk - If required, use vegan milk instead.
birthday brownies cut into squares on a round chopping board

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Necessary gear: Equipment

You'll need an 8x8" baking pan (or a 9x9" will also be fine).

Some mixing bowls, a cooling rack and whisk. Find some affiliate links in the recipe card at the bottom of this post.

How to store leftovers

These birthday brownies can be stored at room temperature in an airtight container for up to 3 days. In the refrigerator for 1 week.

They do freeze well, but I recommend not frosting the brownies and freeze them before. Then when you need to take them out, frost them then.

Mel's kitchen notes

Do not overmix your brownie batter or you'll end up adding air to it. This will then cause it to rise a little - but then it'll sink in the middle.
Dress up your birthday brownies in the most festive way appropriate for whoever you are making them for. Serve with ice cream too.

a stack of birthday brownies, one with a bite taken out with happy birthday in the background

More great brownie recipes I think you'll love

  • a close up of a moist banana brownie with a banana in the background
  • close up of vanilla brownie on a wooden board
  • Close up of a snickers brownie from the side.
  • a close up of a finished banana pudding brownies with vanilla wafers on top
  • Banana Brownies
  • Vanilla Brownies
  • Snickers Bar Brownies
  • Banana pudding Brownies
  • Caramel Swirl Blondies
  • Sizzling Brownie

Or, if you like chocolate oat bars, these M&M Chocolate Oat Bars are great for birthdays too!


If you’ve tried these Birthday Brownies or any other great recipe on my site, let me know in the comment section below, how it turned out, we love hearing from our readers!

If you love this recipe please give it 5 stars! ⭐️⭐️⭐️⭐️⭐️

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a close up of a stack of birthday brownies, three of them, with a set of happy birthday candles in the background
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Birthday Brownies

Delicious fudgy brownies that with some buttercream frosting and rainbow sprinkles make the best birthday brownies!
Prep Time5 minutes mins
Cook Time40 minutes mins
Cooling and Decorating Time30 minutes mins
Total Time1 hour hr 15 minutes mins
Servings: 9
Cuisine: Brownies
Author: Melanie Cagle
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Equipment

  • Hand Mixer
  • Glass Mixing Bowls
  • Square Cake Pan, 8-inch

Ingredients

  • 1-½ Cups Granulated Sugar
  • ¾ Cup All Purpose Flour
  • ⅔ Cup Unsweetened Cocoa Powder
  • ½ Cup Powdered Sugar
  • ½ Cup Semi-sweet Chocolate Chips
  • ¾ teaspoon Salt
  • 2 Each Large Eggs
  • ½ Cup Unsalted Butter unsalted and melted
  • 2 Tablespoons Vegetable Oil
  • ½ teaspoon Vanilla Extract

Buttermilk Frosting

  • ½ Cup Unsalted Butter Salted and softened
  • 3 Cups Powdered Sugar
  • 1 teaspoon Vanilla Extract
  • 2 Tablespoons Milk
  • Rainbow Sprinkles

Instructions

  • Preheat the oven to 325°F.
  • Add the sugar, flour, cocoa, powdered sugar, chocolate chips and salt to a medium mixing bowl and mix together well.
    1-½ Cups Granulated Sugar, ¾ Cup All Purpose Flour, ⅔ Cup Unsweetened Cocoa Powder, ½ Cup Powdered Sugar, ½ Cup Semi-sweet Chocolate Chips, ¾ teaspoon Salt
  • Add the Eggs, melted butter (cooled), oil and vanilla to a large mixing bowl and mix together well.
    2 Each Large Eggs, ½ Cup Unsalted Butter, 2 Tablespoons Vegetable Oil, ½ teaspoon Vanilla Extract
  • Add the dry ingredients from step 1 to the wet ingredients in step 2 and stir carefully until just combined.
  • Line a greased 8x8" Baking pan with parchment paper and lightly spray with cooking oil.
  • Spread the brownie batter into the baking pan evenly. Bake in the preheated oven for 40 minutes.
  • Remove and allow to cool completely.
  • In a large mixing bowl add the softened stick of butter and beat until creamy.
    ½ Cup Unsalted Butter
  • In batches (so you don't make a mess) add the powdered sugar. Then the vanilla and milk.
    3 Cups Powdered Sugar, 1 teaspoon Vanilla Extract, 2 Tablespoons Milk
  • Once you have the desired consistency for the frosting spread evenly over the brownie slabs.
  • Decorate with desired sprinkles then cut into 9 squares.
    Rainbow Sprinkles

Notes

If you find the frosting too wet/loose add more powdered sugar. If you find it to stiff, add a little more milk.
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Nutrition

Serving: 1g | Calories: 677kcal | Carbohydrates: 105g | Protein: 4g | Fat: 28g | Saturated Fat: 15g | Polyunsaturated Fat: 11g | Trans Fat: 1g | Cholesterol: 96mg | Sodium: 279mg | Fiber: 2g | Sugar: 92g

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Filed Under: Brownies and Bars, Dessert Recipes, Snack Recipes

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