Picnic Cake Recipe - Allrecipes.com
Picnic Cake Recipe
  • READY IN 55 mins

Picnic Cake

Recipe by  

"This is a great, moist, banana flavored cake."

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Ingredients Edit and Save

Original recipe makes 1 9x13 inch cake Change Servings
  • PREP

    10 mins
  • COOK

    45 mins

    55 mins


  1. Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9x13 pan. Place marshmallows in a single, even layer in the bottom of the pan.
  2. Sift together flour, salt, baking soda, and baking powder. Set aside.
  3. In a large bowl, cream together the margarine and sugar until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla. By hand, stir in the flour mixture alternately with the buttermilk, mixing just until incorporated. Fold in nuts and bananas.
  4. Pour batter over marshmallows, making sure that marshmallows are covered, and that the batter reaches all sides of the pan.
  5. Bake on center rack of oven for 45 minutes. Marshmallows will rise to top and make a topping. The cake may look slightly underbaked because of the marshmallow topping. Allow the cake to cool before serving.
Kitchen-Friendly View


  • Tip
  • Aluminum foil can be used to keep food moist, cook it evenly, and make clean-up easier.

Reviews More Reviews

Most Helpful Positive Review
Apr 15, 2011

Delicious and very moist. Lots of banana flavor! Nice change from banana bread. Halved recipe, except buttermilk (used 1/2 cup) and baked in 9"x9" pan. Substituted single layer of miniature marshmallows, avoiding the problems others had with the large marshmallows. Batter will be very thick. Covered cake pan with baking sheet last 10 minutes of baking time to prevent over browning. Watch closely, you may need to lower oven temperature. Baked for 30 minutes.

Most Helpful Critical Review
May 15, 2008

The recipe would be great without the marshmallows. Mine rose to the top as the recipe said they would, but they burnt to a toasty crisp. Even if they wouldn't have burnt, they let large holes from where they rose--leaving large gaps in the cake. Very ugly. I gave three stars because the cake itself was good--just leave out the marshmallows.

Apr 11, 2011

This cake has a good taste, but a poor overall appearance. I had to make a "foil tent" to put on the cake at the 30 minute mark as the marshmallows were done but the cake part was not. I would make again for my family but would not make this to take to an outing.

Jun 15, 2009

We really liked this. I didn't have any buttermilk so used ordinary milk with 1/2 T of vinegar added. I also didn't use the nuts. I had no trouble with the marshmallows burning although my cake was done in about 35 minutes. I liked the slight toffee taste the marshmallows added. Thankyou ICOOKSOME.

May 29, 2011

This was amazing. Yes, its didn't look great, but it tasted out of this world. The entire cake was consumed by 4 of us the same night. I just could not get enough of the taste of this. If you are trying to diet, please do not taste this cake because you will want bite after bite after bite. It is amazingly moist and the marshmallow 'topping' is exactly the right amount of crispy crunch. I followed the instructions except I baked this for only 35 minutes.

Aug 08, 2008

MMM!! this was really good.

Jan 24, 2012

This cake is definitely tasty! However I will call it Ugly Cake instead of Picnic Cake. I had read several reviews beforehand though so it wasn't any surprise. I'm really glad I did because if not I would of had a completely burnt top! I baked it at 350 as directed but set my timer for 35 min. Checked it after 25 min and the cake was just then done inside, the marshmallows rose to the top and melted but already had burnt polka dots across the top. Still very yummy to me as I like the flavor of burnt marshmallow. Essentially this tasted like moist banana bread with a toasted marshmallow crust. It worked out nicely considering I just wanted to find a recipe to use one sad black banana and happened to have marshmallows too. The only thing I didn't have on hand was buttermilk so I used 1/2 tbsp lemon juice mixed into 1/2 cup regular milk which is a well known buttermilk substitute (you can use white vinegar too if you don't have lemon juice). I like this recipe since I can omit the marshmallows in the future to just make a great banana cake. I have friends who love Banana Moon Pies and this would be right up their alley. With the marshmallow craters maybe call it Banana Moon Cake? Thank you for posting!

Jul 23, 2012

Made this for a day of boating. This cake was great-no frosting so it was easy to transport and everyone enjoyed it. Six year old nephew licked the pan! I prepared as written but after reading reviews I took advice and loosely covered with foil after 30 minutes, then baked for additional 10 minutes (40 minutes total) We renamed it "Crater Cake".


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  • Calories
  • 358 kcal
  • 18%
  • Carbohydrates
  • 53.6 g
  • 17%
  • Cholesterol
  • 31 mg
  • 10%
  • Fat
  • 15 g
  • 23%
  • Fiber
  • 1.4 g
  • 6%
  • Protein
  • 5 g
  • 10%
  • Sodium
  • 361 mg
  • 14%

* Percent Daily Values are based on a 2,000 calorie diet.

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