Traditional Cookie Squares

Traditional cookie squares are a simple butter-based bar cookie with a tender crumb and slightly crisp edges. They come together in one bowl, bake in under 30 minutes, and need nothing but a sharp knife and a cooling rack to turn out perfectly.

Ingredients for Traditional Cookie Squares

Butter creams with sugar to create a light, fluffy base that keeps the bars tender. Granulated sugar and brown sugar together add sweetness and depth, with the brown sugar bringing moisture and chew. Eggs bind the dough and help it rise slightly in the oven. Vanilla extract rounds out the flavor. All-purpose flour provides structure without making the bars tough. Baking powder lifts the dough just enough for an even crumb. Salt balances the sweetness and brings out the butter flavor.

Why This Traditional Cookie Squares Works

Creaming the cold butter with both sugars incorporates air into the dough, which helps the bars rise gently and bake through evenly. The eggs warm as they mix into the butter, creating a smooth batter that holds the flour without overworking it. Stopping the mixing as soon as the flour disappears keeps the bars tender instead of tough.

The baking powder lifts the dough in the first few minutes of baking, then the edges set and brown while the center stays soft. Baking at 350°F (175°C) gives you a window of about 5 minutes where the bars are done but still slightly underbaked in the very middle, which is where they stay tender as they cool. Cutting them while they are still warm and in the pan keeps them from cracking.

Mistakes To Avoid

Overmixing after adding the flour is the fastest way to turn tender bars into tough ones. Once you add the flour, fold it in gently with a spatula and stop as soon as you see no white streaks. The batter will look slightly rough, and that is correct.

Baking the bars until they look completely set and golden all over means they will be dry. Pull them from the oven when the edges are golden brown but the very center still looks slightly soft and underbaked, because they keep cooking as they cool in the pan.

Skipping the cooling time and cutting the bars while they are piping hot breaks them apart. Let the pan sit on the counter for 5 to 10 minutes until it is cool enough to touch, then cut with a sharp knife in one smooth motion, not a sawing motion.

Using softened or melted butter instead of cold butter creates a greasy dough that spreads too much and bakes into flat, oily bars. Start with butter straight from the refrigerator, cut into cubes, so it creams properly with the sugar.

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Ingredients

• 1/2 cup unsalted butter, cold and cubed
• 1/2 cup granulated sugar
• 1/4 cup packed brown sugar
• 1 large egg, room temperature
• 1 teaspoon vanilla extract
• 1 cup all-purpose flour (125 grams)
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt

Step-by-step Instructions

1. Heat the oven to 350°F (175°C). Line an 8×8 baking pan with parchment paper, leaving overhang on two sides, or lightly grease it.
2. In a large bowl, beat the cold butter cubes and both sugars with an electric mixer on medium speed for 3 to 4 minutes, until the mixture is pale, fluffy, and noticeably lighter in color.
3. Add the room-temperature egg and vanilla extract to the creamed butter and sugar. Beat on medium speed for 1 to 2 minutes until the mixture is smooth and no streaks of egg remain.
4. In a separate bowl, whisk together the flour, baking powder, and salt.
5. Add the flour mixture to the wet ingredients and fold gently with a rubber spatula until no white streaks of flour are visible. Stop mixing as soon as the dough comes together, do not overmix.
6. Spread the dough evenly into the prepared pan, using the spatula to smooth the top.
7. Bake at 350°F (175°C) for 22 to 25 minutes, until the edges are golden brown and a toothpick inserted in the center comes out with a few moist crumbs clinging to it. The very center should look slightly underbaked.
8. Let the pan cool on a wire rack for 5 to 10 minutes, until it is cool enough to touch but still warm.
9. While the pan is still warm, cut the bars into 16 squares using a sharp knife, wiping the blade clean between cuts for neat edges.
10. Let the bars cool completely in the pan on the rack before removing them, about 20 minutes, then serve or store.