Mrs. Farmer Jones

Banana Bars with Brown Butter Frosting

Banana Bars with Brown Butter Frosting

Banana Bars with Brown Butter Frosting – Can you say that 5 times fast?!

hah! Me either!

Buuuuuut, I can eat 5 of these bars in a row!! THEY ARE DELICIOUS!

I got this delicious recipe from Life’s Simple Measures and I’m so glad I did! You will want to always have overripe bananas on your counter to make these wonderful bars!

Let’s get started!

Step 1:

In your mixing bowl, blend together 1 1/2 cups of sugar, 1 cup of sour cream, (or in my case I used 1 cup of plain yogurt.) 1/2 cup of softened butter, and 2 eggs.

I LOVE LOVE LOVE my KitchenAid Mixer, and my cute mini KitchenAid Spatula set that my future sister-in-law got me!

Banana Bars Step 1

Step 2:

Mash up about 4 bananas and mix into your mixing bowl along with 2 teaspoons of vanilla extract.

I save myself some time and just mash the banana inside the peel!

Step 3: 

Once bananas are incorporated, add 3/4 teaspoon of salt, 1 teaspoon of baking soda, and 2 cups of flour.

**Optional** fold in 1/2 cup of chopped walnuts.

Step 4:

Spread batter evenly into your greased, and lightly floured jelly roll pan (15×10). Bake in preheated 375F oven for 20-25 minutes.

*From my experience making this recipe, make sure to bake this long enough! The top should be a golden brown, and when you stick a toothpick in it, it should come out completely clean! I love to under bake my cookies and such, but I highly recommend baking this until it looks like this picture below!!

Banana Bars out of the oven

Step 5:

While the bars are baking, go ahead and start the brown butter frosting. In a saucepan, heat 1/2 cup of butter (I use unsalted butter for all my baking) over a medium heat until it boils. Let the butter turn a light brown, BE SURE TO WATCH THE WHOLE TIME. It will turn a light brown very quickly, and if you burn the butter, DO NOT USE IT. You will taste how burnt the butter is, so just start over! Once the butter is a light brown, immediately take it off the burner.


Step 6:

In a new mixing bowl, add 4 cups powdered sugar, 1 1/2 teaspoons vanilla extract, 3 tablespoons of milk, and your browned butter. It should be fairly thick, not runny like a glaze!

Step 7:

Once the bars have cooled down, and when I say cooled down, I mean let them cool down almost all the way, spread the frosting on the bars! I had a bad experience of putting the frosting on the bars while they were fairly warm and it soaked into the bars making them taste like banana mush!

Banana Bars with frosting

Banana Bars cut up

Don’t they look delicious?!?! 

Banana Bars with Brown Butter Frosting
Yields 2
Divine banana bars with thick brown butter frosting
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Banana Bars
  1. 1 1/2 cup sugar
  2. 1 cup sour cream (or substitute 1 cup plain yogurt)
  3. 1/2 cup butter, softened
  4. 2 eggs
  5. 1 3/4 cup (3 or 4) ripe bananas, mashed
  6. 2 teaspoons vanilla extract
  7. 3/4 teaspoon salt
  8. 1 teaspoon baking soda
  9. 2 cups all purpose flour
  10. **Optional 1/2 cup chopped walnuts
Brown Butter Frosting
  1. 1/2 cup butter
  2. 4 cups powdered sugar
  3. 1 1/2 teaspoons vanilla extract
  4. 3 tablespoons milk
  1. Preheat oven to 375F
  2. Grease and lightly flour 15x10 inch jelly roll pan.
  3. In mixing bowl, beat together sugar, sour cream (or yogurt), butter, eggs until creamy.
  4. Mash bananas.
  5. Mix in bananas and vanilla.
  6. Add flour, baking soda, salt. blend until combined.
  7. **Optional fold in walnuts.
  8. Spread batter evenly into jelly roll pan. Bake 20 to 25 minutes until golden brown.
  9. Start frosting by heating butter in a saucepan until it boils and turns light brown. Remove from heat.
  10. In mixing bowl, combine powdered sugar, vanilla, milk, and butter. Whisk until smooth, should be thicker than glaze.
  11. Spread frosting over bars once they are cooled.
  12. ENJOY!
Mrs. Farmer Jones

Did try this recipe? Let me know how it went!


About katward02

A farmer's wife in southwest Iowa. I love to cook, eat, craft, and sometimes clean. We try to live a simple life on the farm, and enjoy everyday that we are blessed to live.

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