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Mud Hen Bars

Nutriforks
Nutriforks
·6 min read·Published: Oct 1, 2025
Mud Hen Bars
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These Mud Hen Bars are the ultimate potluck dessert with a buttery crust, gooey chocolate, and marshmallow meringue. Easy to make and always a hit!

Here’s what to make next: Crispy Chocolate Chip Oatmeal Cookies, Strawberries and Cream Bars, and Pumpkin Chocolate Chip Bundt Cake.

Why These Mud Hen Bars Always Steal the Show

Mud Hen Bars have a way of disappearing fast. The combination of a buttery cookie crust, a gooey middle packed with marshmallows and chocolate chips, and a chewy brown sugar meringue topping is pure comfort. I first brought these to a potluck, and by the time I sat down, the pan was nearly empty. That’s when I knew this recipe was a keeper.

What Makes These Brown Sugar Meringue Bars Special

  • Three distinct textures in every bite: a crisp crust, a sticky-sweet filling, and a caramelized meringue.
  • Made entirely in one 9×13 pan, so cleanup is easy and it feeds a crowd.
  • The brown sugar meringue is a fun twist on the usual plain meringue, adding depth of flavor.

Key Ingredients for Mud Hen Bars

  • Butter: Use unsalted butter so you can control the salt level. Soften it to room temperature for easy creaming.
  • Brown sugar: Light brown sugar gives a mild caramel flavor. Dark brown sugar will make the meringue richer and more molasses-like.
  • Egg whites: Room-temperature egg whites whip up to a higher volume than cold ones. Separate the eggs while cold, then let the whites sit out for 15 minutes before beating.

Kitchen Tools You’ll Need for Mud Hen Bars

  • 9×13-inch baking pan
  • Stand mixer or hand mixer with whisk attachment
  • Medium mixing bowl for dry ingredients
  • Rubber spatula for folding
  • Sharp knife for cutting

Tips for Making the Best Mud Hen Bars

Getting the meringue right is the trickiest part. Beat the egg whites until they form stiff peaks before folding in the brown sugar. If the meringue isn’t stiff enough, it will spread too thin and won’t hold its texture after baking. When you spread the meringue over the marshmallows and chocolate chips, use a spatula to gently push it to the edges without disturbing the sticky layer beneath. Bake until the meringue is a deep golden brown, which takes about 30 minutes. Let the bars cool completely in the pan before cutting, or you’ll end up with a messy gooey mess.

Expert Advice for Perfect Chocolate Marshmallow Bars

For the most stable meringue, make sure your bowl and beaters are spotless and free of any grease. A tiny bit of yolk in the whites will prevent them from whipping up. You can use light brown sugar or dark brown sugar; dark will give a stronger molasses flavor. If you skip the nuts, consider adding a few extra chocolate chips to make up for the missing crunch. The bars keep well at room temperature for a couple of days, but if your kitchen is humid, store them in the fridge to keep the meringue from getting sticky.

Tips for Cutting Clean Mud Hen Bars

Because these bars have a sticky marshmallow-chocolate layer and a delicate meringue, cutting them cleanly takes a little care. Chill the pan in the refrigerator for 15 minutes after they’ve cooled completely. Use a long, sharp knife and cut straight down without sawing. Wipe the blade with a damp paper towel between each cut. This gives you neat squares without dragging the meringue or squishing the filling.

Mud Hen Bars Variations to Try

You can swap the semi-sweet chocolate chips for dark or milk chocolate depending on your preference. Pecans or walnuts both work well in place of the specified nuts. For a twist, add a handful of shredded coconut along with the chocolate chips. To make these gluten-free, substitute the all-purpose flour with a 1-to-1 gluten-free baking blend. If you want a more intense meringue flavor, use dark brown sugar instead of light.

How to Serve Mud Hen Dessert Bars

Serve these bars as-is for an afternoon snack, or dress them up with a scoop of vanilla ice cream or a drizzle of warm caramel sauce. They also pair nicely with a cold glass of milk or a strong cup of coffee. For a party platter, cut them into small squares and arrange on a plate with fresh berries for color contrast.

How to Store Leftover Mud Hen Bars

Store Mud Hen Bars in an airtight container at room temperature for up to 3 days. If your kitchen is warm, refrigerate them for up to a week. Stack the bars with a piece of parchment between layers to prevent sticking.

Can You Freeze Mud Hen Bars?

These bars freeze beautifully. Place the completely cooled bars in a single layer on a baking sheet and freeze until firm, then wrap each bar individually in plastic wrap and transfer to a freezer bag. They’ll keep for up to 3 months. Thaw at room temperature for about 30 minutes before serving.

Best Way to Reheat Mud Hen Bars

To bring back that fresh-baked chewiness, reheat the bars in a 300°F oven for 5 to 7 minutes. If you only want to soften the meringue a bit, a quick 10-second zap in the microwave works, but be careful not to overheat or the chocolate will get too runny.

Mud Hen Bars FAQs

Why did my meringue turn out runny?

The most common reason is under-beaten egg whites. They need to reach stiff peaks before you add the brown sugar. Also, make sure no grease or egg yolk got into the whites.

Can I use jumbo marshmallows instead of mini?

Yes, but cut them into quarters so they distribute evenly. Whole jumbo marshmallows would create large pockets of melted marshmallow.

Do I have to add nuts?

No, you can leave them out. The bars will still be delicious. You might want to add a few extra chocolate chips to replace the volume.

Can I use a different size pan?

This recipe is designed for a 9×13 pan. If you use an 8×8, the bars will be very thick and you’ll need to increase baking time by 5 to 10 minutes.

Can I double this recipe?

You can, but you’ll need a half-sheet pan (about 12×17 inches) and increase baking time by about 5 minutes. Keep an eye on it.

Recipe

Mud Hen Bars

Mud Hen Bars

These sweet Mud Hen dessert bars are perfect for potlucks and parties! Everyone loves them!

easyVegetarian

10 min

Prep Time

30 min

Cook Time

40 min

Total Time

24

Servings

Dessert

Course

American

Cuisine

268 kcal

Calories

Ingredients

Servings
  • 0.5 cup butter, at room temperature
  • 1 cup granulated sugar
  • 3 large eggs, divided (1 whole egg, 2 yolks, and 2 whites)
  • 1 tsp vanilla extract
  • 1.5 cup all-purpose flour
  • 1 tsp baking powder
  • 0.25 tsp salt
  • 0.5 cup semi-sweet chocolate chips
  • 1 cup mini marshmallows
  • 1 cup chopped nuts, optional
  • 1 cup light brown sugar

Instructions

  1. 1

    Preheat oven to 350 degrees F. Grease a 9×13 pan and set aside.

  2. 2

    In the bowl of a stand mixer, beat together butter and granulated sugar until creamy. Beat in 1 whole egg and 2 egg yolks (put aside the whites for later.) Beat in the vanilla extract.

  1. 3

    In a separate medium bowl, whisk together the flour, salt, and baking powder. Add the dry ingredients to the wet ingredients. Blend until just combined. Spread mixture into 9×13″ pan. Sprinkle with marshmallows, chocolate chips, and nuts-if using.

  2. 4

    Beat egg whites until stiff peaks form. Gently fold in the brown sugar. Spread mixture evenly over marshmallows and chocolate chips. Bake for about 30 minutes or until bars are a deep golden brown. Let bars cool completely. Cut into squares and serve.

Nutrition (per serving)

268kcal

Calorie breakdown

Protein4%11 kcal
Fat28%77 kcal
Carbohydrates68%184 kcal
How this was calculated — 10 of 11 ingredients matched
butterButter, salted860 kcal
granulated sugarSugars, granulated924 kcal
vanilla extractVanilla extract14 kcal
all-purpose flourFlour, wheat, all-purpose, enriched, bleached1318 kcal
baking powderLeavening agents, baking powder, low-sodium5 kcal
saltSalt, table0 kcal
semi-sweet chocolate chipsChocolate, dark, 60-69% cacao solids695 kcal
mini marshmallowsToppings, marshmallow cream773 kcal
chopped nutsNuts, acorns, raw929 kcal
light brown sugarSugars, brown912 kcal
Serving size ≈ 65 g · 24 servings

Nutrition information is automatically calculated from USDA FoodData Central, so should only be used as an approximation. Actual values may vary depending on the ingredients, brands, and preparation methods used.

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Keyword: bars, dessert, Oven Baked, potluck, vegetarian

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Tags:barsdessertpotluckvegetarian

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Nutriforks

NutriForks is a home-cooking site built around two simple ideas: recipes should actually work, and you should know what’s in them. Every recipe pairs clear, tested instructions with a full nutrition breakdown, so healthy, everyday cooking is genuinely easy.

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