Pineapple butter rum cake (gluten-free)

Pineapple butter rum cake is following me everywhere…and I have zero problems with it.

Pineapple cake with butter rum sauce | | #pineapplecake

We had a date night a couple of weeks ago at Steel Magnolia’s, and dessert was the most decadent tropical pineapple cake with rum sauce and ice cream. I thought about it EVERY DAY until like 5 days later, when I went to cooking club, and one of the girls had made a very similar and equally delicious creation. I’m 100% a brownie or chocolate girl through and through, but this dessert was everything I didn’t know I needed in my life.

Everything about it screams, “spring” and the bright pineapple flavor pairs perfectly with the buttery brown sugar and spiced rum sauce. We all like butter in our house, but P wins the prize for #1 fan. The Butter Bandit is notorious for finding the pack of Kerrygold in the fridge and leaving finger scoops and teeth marks in it. 

Anyway, back to the cake! So I was thinking about making a similar creation to the versions I’ve had recently, and remembered the pack of Simple Mills vanilla cake mix in the pantry. I decided to go all Cake Doctor on it and add sliced pineapples, a rum, coconut sugar, and butter sauce,

Butter sauce

and it’s basically the treat we all need this spring. 


Simple Mills cake mix

Also, since the main component is pre-made, this cake comes together super quickly and is grain-free with no refined sugar. Basically that makes it a fruit salad.

Grain free pineapple butter rum cake made with no refined sugar. This is the spring dessert you've been looking for! | | #pineapplecake #grainfreedessert #easterdessert #springdessert #pineapplebutterrumcake

Here’s the recipe if you’d like to give it a try!

Grain-free pineapple butter rum cake
A super easy grain-free cake recipe with tropical pineapple, spiced rum, coconut sugar, and butter.
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Prep Time
15 min
Cook Time
30 min
Prep Time
15 min
Cook Time
30 min
  1. 3 tablespoons butter
  2. 1 cup coconut sugar
  3. 1/2 cup dark rum
  4. 1 box Simple Mills vanilla cake mix
  5. 3 eggs
  6. 1/3 cup oil
  7. 1 tablespoon vanilla
  8. 1 20-oz can of sliced pineapple in pineapple juice
  9. 1/3 cup pineapple juice (I used the juice from the can!)
  1. Grease a glass 9x12 pan and preheat the oven to 350
  2. In a large saucepan on medium heat, warm the butter until melted, and stir in the coconut sugar and rum. Bring up to a boil and cook on high heat for about 30 seconds. Add the sliced pineapples (keep the juice!), stir well, and remove from heat.
  3. Prepare the cake batter by combining the mix with the pineapple juice, oil, mix, eggs, and vanilla. Stir well to combine.
  4. Add the slices of pineapple to the bottom of the baking dish (keep the rest of the butter sauce) and pour the batter on top.
  5. Bake for 28-30 minutes (until a toothpick inserted comes out clean) and set aside to cool slightly. Drizzle a little butter sauce on each slice before serving.
The Fitnessista
Pineapple cake with butter rum sauce

What’s your favorite spring or summer dessert? Are you usually an ice cream or cake person (or both)? 



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  1. Dominique on March 7, 2018 at 11:33 am

    The butter bandit thing is so funny. Our 5-year-old is always asking for spoonfuls of honey and butter. And I remember my youngest brother and sister would sneak under the dining room table with the butter dish and devour it.

  2. V on March 7, 2018 at 12:42 pm

    I thought you were dairy-free?

    • Fitnessista on March 7, 2018 at 1:03 pm

      i am for the most part. i still have butter and the occasional cheese board 😉

  3. Tammy on March 7, 2018 at 7:52 pm

    Mmm this looks amazing! I don’t have simple mills here in Canada so I would try it with a different boxed vanilla cake. Thanks for sharing Gina! P. S. Your Butter Bandit comment made me laugh, my 2 year old is constantly in the fridge eating whatever he can get his hands on.

  4. Megan @ Skinny Fitalicious on March 8, 2018 at 9:30 am

    My boyfriend would love this. He’s LOVES pineapple!

  5. Emily @ Pizza & Pull-Ups on March 8, 2018 at 10:11 am

    This looks awesome, what a great spring dessert.

  6. Jennifer on March 9, 2018 at 9:16 am

    I’ve never made a pineapple upside down cake… but if you put rum in it.. I should totally try it out.

    P sounds like me what I was little. I remember I use to always try and sneak lots of sour cream and butter, but from the way my Mom describes my eating habits at that time, I just wasn’t getting enough calories. So that’s probably why I loved those high fat foods. lol Good news is that it is just a phase (thank goodness, that would be gross if I kept eating plain butter as an adult)

  7. Claudia on March 12, 2018 at 6:05 am

    We don‘t have Simple Mills here in Germany and I haven‘t Seen a lot of grain free cakemixes here (autocorrect just made that „brain free“ LOL). Woul you mind listing the ingridients so I can improvise? That cake sounds heavenly, I need it in my life.

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