Chocolate Sheet Cake with Chocolate Frosting

For Chocolate Sheet Cake with Vanilla Buttercream Frosting, click here.

This is the BEST Gluten-free Chocolate Sheet Cake with Chocolate Buttercream Frosting!

It has

• an incredible soft and moist texture,
• the best chocolate flavor,
• a perfect cake to frosting ratio, and
• the most amazing chocolate frosting ever!
• And it takes just 10 minutes to mix the batter and get the cake in the oven!

And before we get too far, full disclosure, this is the same recipe as our Chocolate Sheet Cake with Vanilla Buttercream Frosting and I have both frosting options below, but this chocolate frosting is too good not to get it’s own spotlight!

And… the Chocolate Sheet Cake is essentially our Best Chocolate Cake with quantities and baking time revised to fit a half sheet cake size…  and it’s a new favorite!

I made this Chocolate Frosting version for family the other day to celebrate my niece’s birthday and everyone went crazy for it! Everyone loves the sheet pan size cake– it’s just the right amount of cake and frosting!

Need any more convincing, just look at this photo!

A little more background before we get into the details of making it…

I made this  using a half sheet pan size that you all love for our Yellow Sheet Cake recipe, and it’s perfect for feeding a small gathering and not having too much left over.

And a quick note about the Best Chocolate Cake this is based on, in case you haven’t seen it or made it yet.

The recipe is from my Aunt and it’s a longtime family favorite, which we make gluten-free using our favorite gluten-free all purpose flour, GF Jules (affiliate link).

It is moist, has most amazing chocolate flavor and texture and SO GOOD! It’s that cake that my entire extended family makes whenever we need a cake — birthdays, holidays, random get togethers.

It makes a full size cake or doubles well for a double layer cake (shown here). I’ve recently made it as Chocolate Cupcakes and had so many requests for this sheet cake size, which is my favorite yet!

So let’s make the gluten-free Chocolate Sheet Cake….

I have a cooking video on this page of the one I made with vanilla frosting — I will update soon with the chocolate frosting!– so you can see how easy they are to make.

As with all my recipes, there is a printable recipe with exact measurements and directions on the bottom of this page.

It’s made with all the usual goods —

all purpose gluten-free flour (we use with GF Jules -affiliate link )

sugar

egg

Hershey  cocoa (100% cacao unsweetened)

baking powder

baking soda

salt

canola oil

vanilla

coffee (we used a dark roast decaf) 

buttermilk (you can make some!) for extra flavor and moistness.

As an aside, you may have noticed that we are affiliate for GFJules.  To learn more about why we love GFJules flour and why we have used it for 10 years, click here.

Bonus: at the bottom of that post is a one-time use affiliate Discount Code.

And importantly, purchasing through an affiliate link does not change your cost at all. It generates a small percentage of the sale for me, and purchasing through an affiliate link helps me fund this website and all the recipes I share, so thank you!

Back to the gluten-free Chocolate Sheet Cake with Chocolate Frosting…

It is the easiest recipe ever!

All you do it mix the dry ingredients together, add in the wet ingredients and mix for 2 minutes until smooth and luscious.

Then pour into a prepare rimmed baking sheet and bake!

Pro Tip: It only bakes for 20-22 minutes but I always check at 20 minutes and cover the top loosely with foil so the top doesn’t burn.

Let cool completely and it’s time to frost it!

Like I said, we have recipes for both an amazing creamy vanilla frosting and this luscious chocolate frosting.  You can’t go wrong with either!

And after seeing how easy they are to make and how yummy they are, you will never use store-bought frosting again!

And The Best Chocolate Frosting is made with just 5 ingredients, mixed together in a stand mixer or hand mixer:

butter or dairy-free butter

cocoa powder (we use Hershey’s cocoa, 100% cacao unsweetened)

vanilla extract

powdered sugar (also known as confectioner’s sugar)

milk or dairy-free milk

And it is luscious!

The texture is smooth and creamy and the flavor is rich and chocolatey!

Let the cake complete cool, then using an icing spatula, small regular spatula or even a small knife, frost the cake!

The frosting sets pretty quickly.

Then feel free to serve as is, stop with sprinkles or decorate for any occasion.

You can make ahead and store in a cool place or a refrigerator (just bring to room temperature before serving), then slice into it and enjoy!

Just look at this texture!

It’s soft and moist and so perfect! So who wants a slice?

PIN it!

Scroll down for recipe and leave a comment if you make it.