jan's grandmother's puerto rican chocolate cake

South Salty Lakeside, UT
Updated on Mar 3, 2026

This is an heirloom recipe passed from Jan's grandmother to her mom, to Jan, then given to me. This is a delicious, decadent cake that will make you not want to give away the recipe. But please do. Everybody who has eaten this cake loves it, raves about it, and they always try to guess the secret ingredient: cinnamon! But it isn't a secret anymore. From my kitchen to your tummy, I hope you think this cake is yummy! If you don't have buttermilk, use regular milk and add 3 tsp white vinegar.

Blue Ribbon Recipe

An old-fashioned, rich, and chocolaty cake made with very simple ingredients. The cake itself is tender, sweet, and has a hint of spice from ground cinnamon. The fudge-like frosting is super rich and has an extra punch of chocolate flavor. This is a very simple homemade chocolate cake recipe that can be made for any occasion.

prep time 2 Hr
cook time 30 Min
method Bake
yield 8 serving(s)

Ingredients

  • 2 cups all-purpose flour
  • 1 tablespoon corn starch
  • 1 1/2 cups granulated sugar
  • 2 teaspoons baking soda
  • 1 teaspoon salt
  • 1 teaspoon ground cinnamon
  • 2/3 cup water
  • 1 stick butter, softened
  • 4 tablespoons baking cocoa
  • 1 teaspoon vanilla extract
  • 2 large eggs, slightly beaten
  • 3/4 cup buttermilk
  • FROSTING
  • 1/2 stick butter, softened
  • 3 tablespoons baking cocoa
  • 2 tablespoons milk
  • 1 1/4 cups powdered sugar
  • 1/2 teaspoon vanilla extract

How To Make jan's grandmother's puerto rican chocolate cake

Test Kitchen Tips
If you do a layer cake, you'll need to double the ingredients for the frosting.
  • Prep baking pans while the oven preheats.
    Step 1
    Preheat oven to 350 degrees F. Prepare a 9x13 pan with parchment at the bottom or spray it with baking Pam. If using 8-inch round pans, line the bottom with parchment paper.
  • Sift together flour, corn starch, sugar, baking soda, and salt.
    Step 2
    In a large bowl, sift together flour, corn starch, 1 1/2 - 2 cups sugar, baking soda, ground cinnamon, and salt. Do not add the cocoa.
  • Bring water, butter, and cocoa to a slow simmer.
    Step 3
    In a medium saucepan over medium heat, bring the water, butter, and cocoa to a slow simmer, stirring with a flat-bottomed wooden spatula across the bottom and around the sides of the pan to avoid scorching the mixture. Simmer for 5 minutes.
  • Remove from heat and add vanilla extract.
    Step 4
    Remove from the heat and add the vanilla extract.
  • Add chocolate mixture to the dry ingredients.
    Step 5
    Add the contents from the pan to the dry ingredients.
  • Incorporate until barely mixed.
    Step 6
    Incorporate until it is barely mixed.
  • Add slightly beaten eggs and buttermilk to the batter.
    Step 7
    Mix the slightly beaten eggs and buttermilk in a bowl. Add it to the batter.
  • Mix until just incorporated.
    Step 8
    Mix until incorporated, but do not completely mix.
  • Pour the batter into the prepared pans and bake.
    Step 9
    Pour the batter into the prepared pans. Spread the batter evenly. Tap the pan on the counter to allow bubbles to come up. If using a 9x13 pan, bake the cake for 30 minutes or until the cake springs back when touched. If using round tins, bake for 25 minutes. Place pans side by side in the oven. Then switch the positions ofthe pans at the halfway time of baking.
  • Completely cool the cakes.
    Step 10
    Once baked, cool on a cooling rack. Cool completely before making the frosting.
  • Over low heat, stir together butter, cocoa, and milk.
    Step 11
    In a medium-sized saucepan, stir together butter, cocoa, and milk to a slow boil avoid scorching.
  • Remove from heat and beat in powdered sugar and vanilla extract.
    Step 12
    Remove from heat and beat in powdered sugar and vanilla extract.
  • While the frosting is warm, spread over the cooled cake.
    Step 13
    While the frosting is warm, pour it over the cooled cake. The frosting will make its way down the sides.
  • Jan's Grandmother's Puerto Rican Chocolate Cake frosted.
    Step 14
    Use a knife to smooth it to your liking or leave it alone. As the frosting cools, it is easy to spread on the cake.

Nutrition Facts

(per serving*)
calories: 535kcal, carbohydrates: 85g, cholesterol: 95mg, fat: 20g, fiber: 3g, protein: 7g, saturated fat: 12g, sodium: 788mg, sugar: 57g, unsaturated fat: 7g
*Daily Values are based on a 2,000 calorie diet. Nutrition information is estimated.

Discover More

Category: Cakes
Keyword: #Christmas
Keyword: #birthday
Keyword: #decadent
Keyword: #valentine
Keyword: #Any_time
Method: Bake
Ingredient: Flour

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