Mini Texas sheet cake is a thin, tender chocolate cake topped with warm cocoa icing, scaled for a small pan instead of a crowd-size sheet. This version keeps the classic buttery, chocolate-rich flavor and finishes the cake while it is still warm so the frosting settles into a smooth layer.
Ingredients
- 1 cup (125 g) all-purpose flour, spooned into the measuring cup and leveled
- ¾ cup (150 g) granulated sugar
- 2 tablespoons (10 g) unsweetened cocoa powder, preferably natural cocoa
- ¼ teaspoon baking soda
- ¼ teaspoon fine salt
- ½ cup (120 ml) water
- ¼ cup (57 g) unsalted butter, cut into pieces
- 1 large egg, at room temperature
- ¼ cup (60 ml) sour cream, at room temperature
- ½ teaspoon vanilla extract
For the warm icing:
- ¼ cup (57 g) unsalted butter
- 2 tablespoons (10 g) unsweetened cocoa powder
- 2 tablespoons (30 ml) milk, plus 1 teaspoon (5 ml) more if needed
- 1½ cups (180 g) powdered sugar, sifted if lumpy
- ½ teaspoon vanilla extract
- ⅛ teaspoon fine salt
- ⅓ cup (40 g) chopped pecans, optional
Instructions
- Heat the oven to 350°F (175°C). Grease an 8-inch (20-cm) square metal baking pan and line the bottom with parchment, leaving a little overhang to lift out the cake. A metal pan bakes evenly and gives the cake its characteristic shallow shape.
- Whisk the flour, sugar, cocoa, baking soda, and salt in a medium bowl. In a small saucepan, bring the water and ¼ cup (57 g) butter just to a simmer over medium heat, stirring until the butter melts. Remove the pan from the heat and whisk in the cocoa mixture until smooth. Let it cool for about 5 minutes; it should be warm, not steaming hot.
- In a separate bowl, whisk the egg, sour cream, and ½ teaspoon vanilla until smooth. Whisk a spoonful of the warm chocolate mixture into the egg mixture to temper it, then gradually whisk in the rest. Stir just until no dry streaks remain. The batter will be fairly thin; avoid beating it for a long time, which can make the cake dense.
- Pour the batter into the prepared pan and spread it into the corners. Bake for 18 to 22 minutes, until the center springs back lightly when touched and a toothpick inserted in the middle comes out with a few moist crumbs but no wet batter. Begin checking at 18 minutes; an overbaked thin cake dries quickly.
- While the cake bakes, make the icing. Put the remaining ¼ cup (57 g) butter, 2 tablespoons (10 g) cocoa, and 2 tablespoons (30 ml) milk in a small saucepan. Heat over low to medium-low, stirring, until the butter melts and the mixture is smooth; do not let it boil hard. Take it off the heat and whisk in the powdered sugar, ½ teaspoon vanilla, and ⅛ teaspoon salt until glossy. If it is too thick to pour, whisk in the extra teaspoon of milk.
- As soon as the cake comes out of the oven, pour the warm icing over the top and spread it gently to the edges. Sprinkle with pecans if using. Let the cake stand in the pan for at least 20 minutes before cutting so the icing can set. For neat squares, lift it out by the parchment and use a sharp knife, wiping the blade between cuts.
Tips
- Measure flour carefully. Spoon it into the cup and level the top, or weigh it. Scooping directly from the bag can pack in extra flour and make this small cake dry.
- Keep the batter and icing smooth. Temper the egg with a little warm chocolate mixture rather than adding it directly to a very hot saucepan. Sift powdered sugar if it has hard lumps; a few quick whisk strokes usually remove small ones.
- Choose the right pan. An 8-inch square metal pan is the intended size. A glass pan can bake more slowly and may need a few extra minutes; check for doneness rather than relying only on the clock. Do not use a much larger pan, which will make the cake overly thin.
- Make a substitution thoughtfully. Plain full-fat Greek yogurt can replace sour cream in the same amount, though the crumb may be slightly less rich. Walnuts can replace pecans, or leave nuts out for a smooth topping.
Serving Suggestions
Serve the squares at room temperature, when the cocoa icing is set but still soft. A small scoop of vanilla ice cream or a spoonful of lightly whipped cream is a good contrast to the sweet chocolate. Fresh raspberries or sliced strawberries add a tart, fruity note, while hot coffee or cold milk makes a simple accompaniment. For a party, cut the cake into nine generous squares or smaller bite-size pieces; wipe the knife between cuts to keep the icing tidy.
Variations
For a more traditional nut-topped finish, scatter the pecans over the icing immediately so they stick. For a nut-free cake, omit them; toasted coconut is another option, though it changes the flavor. A pinch of cinnamon in the batter adds gentle warmth without turning the cake into a spice cake. To make the chocolate flavor more pronounced, use Dutch-process cocoa only if your baking soda is replaced with ½ teaspoon baking powder; otherwise, stick with natural cocoa as written, because the recipe’s acidity and leavening are balanced for it. You can also add ½ teaspoon instant espresso powder to the hot water; it deepens the cocoa flavor without making the cake taste strongly of coffee.
Storage and Reheating
Once cool, cover the pan or transfer the squares to an airtight container. Refrigerate within 2 hours of baking. The cake keeps for up to 4 days refrigerated; bring a piece to room temperature for about 20 minutes before serving, or microwave it for 8 to 12 seconds to soften the icing. If microwaving, warm only the portion you plan to eat and avoid overheating, which can make the cake tough. To freeze, wrap individual fully cooled squares tightly and freeze for up to 2 months. Thaw, covered, in the refrigerator overnight or at room temperature for about an hour. Do not leave the cake uncovered in a warm room for extended periods, as the icing can become sticky and the cake can dry out.
Frequently Asked Questions
What pan is best for mini Texas sheet cake?
An 8-inch (20-cm) square metal pan gives this recipe the right thickness and bake time. A 9-inch pan will make a thinner cake, so start checking several minutes early. A loaf pan is too deep for the intended sheet-cake texture.
Can I make the cake without sour cream?
Yes. Use the same amount of plain full-fat Greek yogurt. Plain regular yogurt can work too, but if it is loose, drain it briefly so the batter does not become overly wet. The finished cake may be a little less rich.
Why pour the icing over a hot cake?
Warm cake lets the thin cocoa icing spread smoothly and settle into an even layer. If the cake has cooled completely, the icing may thicken before it reaches the edges. If that happens, warm it gently over low heat and add milk a teaspoon at a time.
Can I make it ahead?
Yes. Bake and ice it the day before, let it cool fully, then cover and refrigerate. The icing may lose some gloss after chilling, but the cake remains moist. Let it stand at room temperature before serving for a softer crumb.
How do I know when the cake is done?
Start checking at 18 minutes. The center should spring back lightly, and a toothpick should come out with a few moist crumbs rather than liquid batter. Because the cake is shallow, even a few extra minutes can dry it out.
Can I double the recipe?
Yes. Double every ingredient and bake in a 9-by-13-inch (23-by-33-cm) metal pan. The cake will be somewhat thicker, so allow extra baking time and check the center frequently after about 20 minutes. Make the icing in a saucepan large enough to whisk without splashing.
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