Old-Fashioned Chocolate Texas Cake is the kind of thin sheet cake I make when I want something simple, familiar, and seriously chocolatey. It has that classic tender crumb, and the icing is the real point here.

The cake is rich with cocoa but still light enough to cut into neat squares, and the warm-poured icing sets into a fudgy layer that’s slightly chewy at the edges. I like the optional cinnamon because it adds a quiet “old-school” flavor, but it’s still great without it.

This is one of my go-to desserts for potlucks, holiday tables, and casual weekend baking because it slices fast and serves a lot. It’s also one of those cakes that tastes just as good with a cup of coffee as it does with a cold glass of milk.

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Why You’ll Love This Recipe

Quick to bake: It’s a true sheet cake, so it bakes fast and cools faster than a thick layer cake.

Fudgy icing: The cocoa icing goes on warm and sets into that classic Texas sheet cake finish that’s smooth, shiny, and sliceable.

One-pan easy: No stacking, leveling, or frosting drama. You bake it, ice it, and you’re done.

Great for sharing: This is made for cutting into squares and putting on a platter. It travels well and doesn’t need fancy serving.

Flexible add-ins: Pecans are traditional, but you can swap nuts, skip them, or even add mini chocolate chips to the batter if you want it richer.

Ingredients You’ll Need

Cake

All-purpose flour: I use regular all-purpose flour here. It keeps the crumb tender and works predictably in a thin sheet cake.

Granulated sugar: This is the classic sweetness for Texas sheet cake. It also helps the cake stay soft after it cools.
Baking soda: Don’t swap this for baking powder. Baking soda is what gives the cake the right lift with sour cream in the batter.
Fine salt: A little salt keeps the cocoa flavor from tasting flat. If you only have kosher salt, use a slightly bigger pinch.

Unsweetened cocoa powder: Any unsweetened cocoa works. I usually use natural cocoa, but Dutch-process is fine too if that’s what you keep around.
Unsalted butter: Butter is the main flavor here, especially in a simple cocoa cake like this. If you use salted butter, just go lighter on added salt.
Water: Water helps bloom the cocoa and keeps the batter easy to spread in the pan.

Sour cream: This is what makes the cake taste “old fashioned” to me. Greek yogurt works well too, and buttermilk is a good option if you want it a little lighter.
Eggs: Regular large eggs are perfect. I like them at room temp so the batter mixes up smooth.
Vanilla extract: Use real vanilla if you can. It matters in chocolate cakes where the ingredient list is short.

Ground cinnamon (optional): This is subtle, not spicy. If you like that classic Southern chocolate cake flavor, it’s worth adding.

Nonstick spray: Sheet cakes love to cling to corners. I spray the pan well so the pieces lift out cleanly.

Icing

Unsalted butter: Butter makes the icing taste like old-school cocoa fudge. Let it fully melt so the icing turns glossy.

Milk: Whole milk is what I usually use, but any milk you have is fine. You can also add a splash more at the end if the icing tightens up.
Unsweetened cocoa powder: This gives the icing that classic chocolate frosting flavor without needing melted chocolate.
Powdered sugar: Sift it if yours is lumpy. It makes the icing smoother and easier to spread before it starts to set.

Vanilla extract: A little vanilla rounds out the cocoa. Don’t skip it unless you have to.
Chopped pecans (optional): Pecans are traditional in Texas sheet cake, but walnuts work too. If you’re serving kids or picky eaters, I often leave the nuts out.

Salt: I always add a pinch, then taste. It’s a small thing, but it makes the chocolate taste more like chocolate.

Recipe Instructions

Preheat the oven: Heat the oven to 350°F and grease a 10 x 15-inch sheet pan with nonstick spray.
Mix the dry ingredients: In a large bowl, whisk the flour, sugar, baking soda, salt, cocoa powder, and cinnamon (if using) until evenly combined.
Boil the butter and water: In a saucepan, bring the butter and water to a boil. Whisk in the cocoa, then remove from the heat.

Stir the batter: Pour the hot cocoa mixture over the dry ingredients and stir until combined. Whisk in the sour cream, eggs, and vanilla until smooth.
Bake: Spread the batter evenly in the prepared pan. Bake for about 18 to 22 minutes, until a toothpick comes out with a few moist crumbs.
Start the icing: During the last 5 minutes of baking, melt the butter in a saucepan. Whisk in the milk and cocoa and bring it just to a simmer.

Finish the icing: Remove the pan from the heat and whisk in the powdered sugar, vanilla, and a pinch of salt until glossy and pourable. Add a splash more milk if it seems too thick, then stir in pecans if using.
Ice the cake: Pour the icing over the hot cake and spread it quickly all the way to the edges. Cool for about 20 to 30 minutes so the icing can set, then slice and serve.

Some of my tips!

This is the part that really makes a difference. If you only read one section, make it this one because this is where I share the little trick that helps the recipe turn out so well.

Recipe Tips & Tricks

Use the right pan. A 10 x 15-inch sheet pan gives you that classic thin Texas sheet cake. If you use a smaller pan, the cake will be thicker and the bake time changes.

Don’t overbake it. This cake is best when the center is just set and a toothpick shows a few moist crumbs. If it bakes too long, it can lose that tender texture.

Work fast with the icing. Once the powdered sugar goes in, the icing starts to set pretty quickly. Have your cake out and ready so you can spread it to the corners before it thickens.

Taste the icing for salt. Cocoa and powdered sugar can taste a little one-note if there’s not enough salt. I add a pinch, taste, then add another tiny pinch if it needs it.

Chop nuts fairly small. Big pieces can make the slices crumble a bit. Smaller chopped pecans sit better in the icing and cut cleaner.

Make some touches!

There are plenty of easy ways to serve this depending on the occasion. Keep it simple, or add a few small touches to make it feel a little more special.

Serving Suggestions

Milk: A cold glass of milk is classic with Texas sheet cake. I like it especially when the cake is at room temp and the icing is fully set.
Coffee: This is really good with plain black coffee or a latte. The cocoa icing tastes extra rich with something warm to drink.
Ice cream: Serve a square with vanilla ice cream on the side. It’s also good with butter pecan if you’re using the pecans in the icing.

Berries: Strawberries or raspberries are nice if you want something fresh on the plate. I usually just pile a few next to the cake, no need to fuss.

Save it for later

This section covers how to store leftovers and what parts of the recipe you can prepare ahead of time.

Storage and Make Ahead

Store the cake airtight at room temperature for up to 3 days. I usually keep it right in the pan with a tight lid, or move squares to a container once the icing is set.

If you prefer, you can refrigerate it for up to 5 days. Let slices sit at room temp for a bit before serving so the icing softens slightly.

If you want it longer, you can freeze individual portions in an airtight container. Thaw in the fridge overnight or on the counter until softened.

A few quick answers

This section covers a few extra details that may help before you head to the recipe card.

Recipe FAQs

Can I use a 9 x 13-inch pan instead of a sheet pan?

Yes. The cake will be thicker, so plan on baking it longer, usually about 25 to 30 minutes. I’d keep an eye on it and pull it when a toothpick comes out with a few moist crumbs.

You can use the same icing, but some people like a slightly thicker layer on a 9 x 13. If you want more icing coverage, you can scale the icing up a bit.

What can I use instead of sour cream?

Plain Greek yogurt works well and gives a similar tang and tenderness. Buttermilk also works, but the batter will be a little looser.

My icing is too thick (or too thin). What should I do?

If it’s too thick, whisk in a small splash of milk until it’s pourable. If it’s too thin, whisk in a little more powdered sugar and give it a minute to cool slightly; it thickens as it sits.

Do I have to add pecans?

No, you can leave them out. The icing sets nicely either way, and nut-free slices tend to cut a little cleaner.

Before you go, take a look at a few other recipes below the recipe card. They use similar ingredients in a different way and are worth saving too.

Old-Fashioned Chocolate Texas Cake

Old fashioned chocolate Texas sheet cake with a fudgy cocoa icing poured on warm cake for a classic thin tender crumb

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Prep Time 15

Cook Time 20

Total Time 35

Servings 24