Texas sheet cake cookies put the whole sheet cake into one soft, round bite: a tender chocolate cookie with buttermilk and a little cinnamon, covered in glossy fudge icing and toasted pecans. The icing sets into a thin, fudgy shell on top while the cookie underneath stays cakey.
The trick is the same as the cake: the icing goes on while the cookies are still warm. Cook 1/4 cup (57 g) of butter with cocoa and milk until it bubbles, whisk in 1 1/2 cups (180 g) of powdered sugar, and spoon about 2 teaspoons over each cookie 10 minutes after they leave the oven. The cookies bake for 9 to 10 minutes at 350°F (175°C), and the whole batch of 20 takes a little over an hour, including 30 minutes for the icing to set.
At a Glance
- Yield: 20 cookies from 2 tablespoon (about 34 g) scoops
- Pan: 2 rimmed half sheet pans lined with parchment, plus a wire rack
- Time: 20 minutes prep, 9 to 10 minutes per sheet, 30 minutes to set
- Difficulty: easy; a hand mixer and a small saucepan
- Key technique: warm icing on warm cookies, pecans on right away
What Makes Them Taste Like the Sheet Cake
Three things carry the flavor over from the cake. Buttermilk, 1/4 cup (60 ml), adds tang and keeps the crumb soft. Natural cocoa, 1/2 cup (40 g) in the dough, gives the reddish, old-fashioned chocolate color. And 1/2 teaspoon of cinnamon, which many Texas cooks add to the cake, sits in the background without tasting like spice cake.
The icing is the part people remember. Boiling butter, cocoa and milk together before adding the sugar dissolves the cocoa fully, so the icing pours smooth and sets with a soft shine instead of drying chalky. On warm cookies it flows into an even layer by itself; on cold ones it sits in a thick blob.
The Ingredients That Matter
The cookies use 11 ingredients and the icing 7, all listed on the recipe card. These are the ones worth a closer look:
- Cocoa powder: natural (not Dutch-process), because the baking soda needs its acid to rise. Dutch cocoa gives flat, dense cookies here.
- Buttermilk: 1/4 cup (60 ml). No buttermilk? Stir 1 teaspoon of lemon juice into 1/4 cup of milk and wait 5 minutes.
- Flour: 1 1/2 cups (190 g) all-purpose, spooned and leveled. More flour turns the cookies dry and domed, and the icing slides off.
- Powdered sugar: 1 1/2 cups (180 g), sifted, or small lumps stay in the icing.
- Pecans: 1/2 cup (55 g), toasted at 350°F (175°C) for 6 to 8 minutes, then chopped. Toasting is what makes them taste like the cake topping.
Scooping and Baking the Chocolate Cookies
Beat the soft butter with both sugars for 2 minutes, then the egg and vanilla. Mix in the buttermilk; it will look a little curdled, which is fine. Whisk the flour, cocoa, 1/2 teaspoon of baking soda, 1/4 teaspoon of salt and the cinnamon, and mix them in on low until just combined. The dough is soft, like thick frosting.
Scoop 2 tablespoon (about 34 g) mounds 2 inches (5 cm) apart, 10 to a sheet. If the dough is too soft to hold a mound, chill it for 15 minutes. Bake one sheet at a time for 9 to 10 minutes.
How to Tell They Are Done
The cookies are ready when the tops have puffed and cracked lightly, the edges look set and matte, and the center springs back slowly when you touch it. At 11 minutes or more they start to dry out, so check at 9.
Leave them on the sheet for 5 minutes, then move them to a wire rack set over parchment. Start the icing right away, so it is ready while the cookies are still warm.
Icing Them While They Are Warm
Melt 1/4 cup (57 g) of butter with 3 tablespoons (15 g) of cocoa and 3 tablespoons (45 ml) of milk in a small saucepan over medium heat. When it bubbles at the edges, about 2 minutes, take it off the heat and whisk in the sifted powdered sugar, 1/2 teaspoon of vanilla and a pinch of salt until glossy.
Spoon about 2 teaspoons onto each warm cookie and nudge it toward the edges with the back of the spoon. Scatter the pecans on at once; after 2 or 3 minutes the surface skins over and they will not stick. If the icing thickens in the pan, stir in 1 teaspoon of hot milk. Let the cookies sit for 30 minutes, until the icing is set to the touch.
Common Problems
| What you see | Why | Fix |
|---|---|---|
| Flat, dense cookies | Dutch-process cocoa | Use natural cocoa with the baking soda |
| Dry, crumbly cookies | Too much flour or baked 11+ minutes | Weigh 190 g flour; check at 9 minutes |
| Icing grainy or chalky | Milk mixture not heated enough | Bring it to a bubble before the sugar |
| Icing sits in a thick blob | Cookies or icing cooled down | Ice warm cookies; thin with hot milk |
| Pecans fall off | Added after the icing skinned | Sprinkle within 1 to 2 minutes |
Variations
- Cake mix shortcut: 1 box (15.25 oz / 432 g) chocolate fudge cake mix, 1/3 cup (75 ml) oil and 2 eggs, baked 9 to 10 minutes. Sweeter and puffier; the icing stays the same.
- No nuts: skip the pecans or use flaky salt on the icing instead.
- Coconut pecan: fold 1/4 cup (20 g) of sweetened coconut into the pecans for a German chocolate twist.
- Mocha: add 1 teaspoon of instant espresso to the dry ingredients.
If you like the coconut pecan route, German chocolate frosting and German chocolate dump cake share the same flavors. For more pecans, try pecan pie dump cake, and for another Texas-named dessert, Texas trash pie.
Make Ahead and Storage
Store iced cookies in a single layer, or stacked with parchment between them, in an airtight container at room temperature for up to 4 days. The icing stays soft and fudgy and the cookies stay cakey.
Freeze un-iced baked cookies for up to 3 months. Thaw them, warm them for 3 to 4 minutes at 300°F (150°C), then ice as usual. Iced cookies also freeze in one layer, but the icing loses some shine. The dough keeps covered in the fridge for 2 days.
On a cookie tray they look good next to chocolate crinkle cookies and cookies and cream cookies.
Quick Answers
Do Texas sheet cake cookies need to be chilled?
No. Chill the dough for 15 minutes only if it is too soft to scoop, for example in a warm kitchen.
Why do you ice them warm?
Warm cookies keep the icing fluid long enough to spread into a thin, even layer that sets glossy, just like on the sheet cake.
Can I use walnuts instead of pecans?
Yes. Toast and chop them the same way. The cake is traditionally made with pecans, but walnuts taste close.
Save This for Your Cookie Box
Pin these Texas sheet cake cookies to a chocolate dessert or potluck board, so the warm-icing step is easy to find next time.
Texas Sheet Cake Cookies
Soft, cakey Texas sheet cake cookies made with buttermilk, natural cocoa and a hint of cinnamon, topped while warm with the classic boiled fudge icing and toasted pecans. The icing is butter, cocoa and milk brought to a bubble, then whisked with powdered sugar, so it pours smooth and sets with a soft shine. Bake the cookies 9 to 10 minutes at 350°F, ice them about 10 minutes later and let the icing set for 30 minutes. Makes 20 cookies that keep soft for 4 days in a tin.
Ingredients
Cookies
- 1/2 cup (113 g) unsalted butter, softened
- 3/4 cup (150 g) granulated sugar
- 1/4 cup (50 g) packed light brown sugar
- 1 large egg, room temperature
- 1 teaspoon vanilla extract
- 1/4 cup (60 ml) buttermilk
- 1 1/2 cups (190 g) all-purpose flour
- 1/2 cup (40 g) natural unsweetened cocoa powder
- 1/2 teaspoon baking soda
- 1/4 teaspoon fine salt
- 1/2 teaspoon ground cinnamon
Fudge icing
- 1/4 cup (57 g) unsalted butter
- 3 tablespoons (15 g) natural unsweetened cocoa powder
- 3 tablespoons (45 ml) milk
- 1 1/2 cups (180 g) powdered sugar, sifted
- 1/2 teaspoon vanilla extract
- pinch of fine salt
- 1/2 cup (55 g) pecans, toasted and chopped
Instructions
- PREP: Heat the oven to 350°F (175°C) and line 2 sheet pans with parchment. Toast the pecans on a small tray for 6 to 8 minutes, then chop.
- CREAM: Beat the softened butter, granulated sugar and brown sugar on medium for 2 minutes. Beat in the egg and vanilla, then the buttermilk.
- DRY: Whisk the flour, cocoa, baking soda, salt and cinnamon. Mix in on low until just combined.
- SCOOP: Scoop 2 tablespoon (about 34 g) mounds 2 inches apart, 10 per sheet. Chill 15 minutes only if the dough is too soft to hold its shape.
- BAKE: Bake one sheet at a time for 9 to 10 minutes, until puffed, lightly cracked and set at the edges. Cool 5 minutes on the sheet, then move to a wire rack.
- ICING: In a small saucepan, heat the butter, cocoa and milk over medium heat until bubbling at the edges, about 2 minutes. Off the heat, whisk in the powdered sugar, vanilla and salt until glossy.
- TOP: Spoon about 2 teaspoons of icing onto each warm cookie and spread it toward the edges. Sprinkle with pecans right away.
- SET: Let the icing set for 30 minutes before stacking or storing.
Notes
- Use natural cocoa, not Dutch-process; the baking soda needs its acid.
- Done: tops puffed and lightly cracked, edges matte, center springs back slowly. Check at 9 minutes.
- Bring the butter, cocoa and milk to a bubble before adding the sugar, or the icing turns grainy.
- Ice the cookies warm and add the pecans within 1 to 2 minutes.
- Storage: airtight at room temperature 4 days; freeze un-iced cookies 3 months.
Nutrition Information:
Yield:
20Serving Size:
1Amount Per Serving: Calories: 201Total Fat: 10gSaturated Fat: 5gTrans Fat: 0gUnsaturated Fat: 4gCholesterol: 28mgSodium: 70mgCarbohydrates: 29gFiber: 1gSugar: 19gProtein: 2g
