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Mud Hen Bars

Picture of a mud hen bar on a white plate

Mud Hen Bars are a delicious cookie bar recipe with marshmallows and chocolate chips. The dessert bar recipe is simple to make and combines a chewy bottom with a crunchy top layer for the perfect treat. 

I searched high and low for the origin of these ooey gooey bars. Who came up with the name? How did they come up with it? I really couldn’t find much. All we know for sure is that mud hen bars are delicious.

Things You’ll Need to Make the Chocolate and Marshmallow Cookie Bars:

  • Oven
  • Hand mixer
  • Spatula
  • Butter
  • Sugar
  • Vanilla
  • Eggs
  • Flour
  • Salt
  • Baking powder
  • Chocolate chips
  • Mini marshmallows
  • Light brown sugar
  • Large bowl
  • 13″ x 9″ casserole dish
  • Non-stick spray or butter for greasing the pan 

 

Mud hen bars in a glass dish

There are several ways to make the chocolate chip bars including the recipe I am sharing today. You can also make the mud hen bars with a brownie bottom, or even gluten-free bars. 

How do you make mud hen bars?

  1. Grease the casserole dish.
  2. Mix the softened butter and sugar in a medium-sized bowl and cream together.  
  3. Next, add the vanilla, two egg yolks, and one whole egg and mix into the sugar mixture. Save the egg whites for the top layer.
  4. Add the flour, baking powder, and salt and mix until well blended. 
  5. Press the cookie dough into the greased 13″ x 9″ pan. 
  6. Sprinkle the chocolate chips and marshmallows on the top. 
  7. Finally, add the egg whites to another bowl and beat with the hand mixer until the egg whites form stiff peaks. Add the brown sugar and mix.
  8. Spread gently on top of the chocolate chips and marshmallows. 
  9. Bake approximately 30 minutes or until the top is brown and a cake tester comes out clean.

Recipe and printable instructions listed below

Cookie Bars

A stick of butter in a white bowl

Start by adding the softened butter to a bowl, and if you didn’t set the butter out to soften, you can put it in the microwave for about 15 seconds to help soften it a little. 

 

Sugar and butter inside of a white bowl

Next, pour the sugar into the bowl with the butter.

 

Eggs, butter, and sugar in a white bowl

Add the whole egg and two egg yolks and mix everything together. Be sure to save the two egg whites for the top of the dessert. 

 

Flour, salt, and baking powder in a large bowl.

Next, you’re going to add the flour, salt, and baking powder and mix everything together. This will create your cookie batter. 

If you’d like to have a brownie bottom instead of a cookie, you can get the recipe for homemade brownies from scratch here. They are so chocolatey and delicious. 

 

Raw cookie dough in a white bowl

Take the batter and spread it out into the greased casserole dish. It will be a very thin batter, but it will rise when it cooks. 

 

Cookie dough inside of a casserole dish

If you’re using a spatula to spread the cookie dough into the bowl, you can spray the spatula to keep the dough from sticking. If you’re using your hands, you can even spray a little non-stick spray on your hands. 

 

Cookie dough in a large dish with chocolate chips

Once you’ve spread the cookie dough, sprinkle the chocolate chips over the dough. You can even add a few more if you’re a big chocolate lover. Is too much chocolate a thing? Never!

 

Cookie dough with chocolate chips and marshmallows

Next, sprinkle the marshmallows. Chocolate chips and marshmallows always remind me of S’mores, which I love to eat any time of year. 

Egg White and Brown Sugar Topping

Egg whites in a glass bowl

Add the egg whites to a bowl. Make sure your bowl is clean and dry, otherwise the egg whites might not stiffen like they are supposed to (speaking from experience. More than once. You think I’d learn). 

 

Mixing egg whites with a hand mixer

Beat the egg whites until stiff peaks form. 

 

Brown sugar and whipped egg whites in a glass bowl

Then add the light brown sugar to the egg whites. 

 

Egg whites and brown sugar mixed together in a glass bowl

Mix the egg whites and brown sugar together until blended. It only takes a few seconds to blend the two ingredients. Be sure not to over mix. 

 

Mud hen bars in a casserole dish

Spread the egg white and brown sugar mixture on top of the marshmallow and chocolate chips and bake for about 30 minutes or until a cake tester comes out clean. 

Once the mud hen cookie bars bake, let them cool for a little while. 

Mud Hen Bars

Mud hen bars in a glass dish.

Tips and tricks for making mud hen bars:

  • When you spread the cookie dough into the casserole dish, make sure you’ve greased the casserole dish so the cookie bars won’t stick. 
  • Spray the spatula with a little non-stick spray to help press the dough down without sticking.
  • Make sure the bowl is clean and dry when adding egg whites. If there is even a drop of water it can affect your whites and they will not stiffen like they are supposed to. 
  • While baking, if the top begins to brown before the cookie has completed baking, turn the oven down about 25 degrees. 

Mud hen bars on a white plate

 

Picture of a mud hen bar on a white plate

 

Mud hen bars in a glass dish

 

Other Easy Desserts

Yield: 15

Mud Hen Bars

Mud Hen Bars

Mud Hen Bars are a delicious cookie bar recipe with marshmallows and chocolate chips. The dessert bar recipe is simple to make and combines a chewy bottom with a crunchy top layer for the perfect treat. 

Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes

Ingredients

  • 1/2 cup butter (softened)
  • 1 cup sugar
  • 1-1/2 tsp. vanilla
  • 2 egg yolks
  • 1 whole egg
  • 1-1/2 cups all-purpose flour
  • 1/2 tsp. salt
  • 1 tsp. baking powder
  • 1 cup semi-sweet chocolate chips
  • 1 cup mini marshmallows
  • 2 egg whites
  • 1 cup brown sugar

Instructions

  1. Preheat to 350-degrees. Grease a 13" x 9" casserole dish.
  2. In a medium-sized bowl, add the softened butter and sugar and cream together.
  3. Next, add the two egg yolks, one whole egg, and vanilla and mix.
  4. Add the flour, salt, and baking powder and mix until well blended.
  5. Press the cookie dough into the greased pan.
  6. Sprinkle the chocolate chips and mini marshmallows on top.
  7. In a medium-sized bowl, add the two egg whites and beat until stiff peaks form.
  8. Add the brown sugar and mix until blended.
  9. Gently spread on top of the chips and marshmallows.
  10. Bake for approximately 30 minutes. The top will be a golden brown and a cake tester comes out clean.

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Nutrition Information:

Yield:

15

Serving Size:

1

Amount Per Serving: Calories: 280Total Fat: 11gSaturated Fat: 6gTrans Fat: 0gUnsaturated Fat: 4gCholesterol: 53mgSodium: 180mgCarbohydrates: 45gFiber: 1gSugar: 33gProtein: 3g
Nutrition is approximate.

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Paula Humphrey

Sunday 23rd of June 2019

It doesn’t specify plain or self rising flour. I know it says baking powder but just curious

Julie Pollitt

Monday 24th of June 2019

Hi Paula, it is all-purpose flour. I changed that in the recipe to reflect it. Thanks for pointing that out. Have a great Monday!

Kathleen

Friday 21st of June 2019

Julie, these bars look amazing!! Congrats on the feature on Meal Plan Monday!

Julie Pollitt

Friday 21st of June 2019

Hi Kathleen! Thank you so much!

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