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Hi, I’m Sophie Bennett. I’m happy you’re here to make chocolate chip cookie bars with me. I love a dessert with a clear method and a little room for your own finishing touch. Today we’re aiming for chewy cookie centers, golden edges, and chocolate chips in every square, with each stage laid out so you can work at a comfortable pace.

This recipe makes 16 bars. Read through the directions first, set out the 9-inch square metal pan, and plan for the resting time before you begin. That small bit of preparation makes it easier to enjoy the process and serve the dessert at its best.

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Why This Recipe Is Awesome

The appeal is chewy cookie centers, golden edges, and chocolate chips in every square. Pressing the dough into one pan gives you familiar chocolate chip flavor without scooping individual cookies. Melted butter keeps the mixing straightforward, while the extra yolk supports a chewy center. An even layer and a fully cooled slab make the biggest difference to the final slices.

Ingredients You’ll Need

The recipe card gives the complete quantities for every component. These ingredient notes explain a few details that make the method easier to follow.

Chocolate supplies both flavor and body. If melting it, use gentle heat and keep stray water out of the bowl.
Flour supplies structure; spoon and level it, or use the gram weight so the mixture does not become unnecessarily dry.
Butter contributes flavor and texture. Use it cold, softened, or melted exactly where specified; those states perform different jobs.
Sugar controls sweetness and also affects tenderness. Keep the measured amount rather than making a large reduction on the first attempt.

Ingredients measured for chocolate chip cookie bars.

Tools & Accessories for This Recipe

Choose equipment that suits the recipe size and your workspace. These basic tools help with measuring, mixing, and handling the finished dessert.

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9-inch square metal pan — the specified size and shape for this batch. Find on Amazon
Digital Kitchen Scale — measuring the base and filling ingredients consistently. Find on Amazon
Mixing Bowls — keeping the recipe components separate until assembly. Find on Amazon
Silicone Spatula — reaching the corners of the bowl and leveling the mixture. Find on Amazon
Parchment Paper — making a sling when the recipe calls for one. Find on Amazon
Sharp Kitchen Knife — cutting cooled bars neatly and evenly for serving. Find on Amazon

Step-by-Step Instructions

Heat the oven to 350°F (175°C). Line the square pan with parchment handles, then grease any exposed metal along the sides.
Whisk melted cooled butter and both sugars until combined. Add egg, extra yolk, and vanilla, mixing into a glossy base.
Whisk flour, baking soda, and salt in another bowl. Fold the dry mixture into the butter mixture without prolonged stirring.
Fold in chocolate chips, reserving a tablespoon for the surface if desired. Check the bottom of the bowl for hidden flour.
Press dough evenly into the pan, reaching all four corners. Scatter any reserved chips on top and press them in lightly.
Bake 24–30 minutes, until the edges are golden and the center looks set. A tester should show moist crumbs rather than raw dough.
Cool completely in the pan on a rack. The center will settle slightly and become easier to slice as the butter cools.
Lift out by the parchment, cut into 16 bars, and separate with a thin spatula. Store only after all residual warmth has escaped.

Four stages of making chocolate chip cookie bars, from preparation to the finished dessert.

Use a metal pan when specified, since it responds differently to oven heat than a thick glass dish. Set the pan on the center rack and keep the surrounding space clear for even heat circulation.

Common Mistakes to Avoid

Level the dough before baking; a thick mound in the center can remain underdone after the edges have browned.
An uneven layer can leave the center underdone while the edges overbake. Spread the mixture into the corners at the same thickness.
Changing pan dimensions changes depth and timing. Use the listed pan for this batch and begin checking near the earlier time.
Cutting while hot can tear the crumb or release loose filling. Wait until the recipe has cooled or chilled fully.

Alternatives & Substitutions

Replace 1/3 cup chocolate chips with the same volume of chopped toasted pecans for added crunch.

Keep the main structure of the recipe intact when making this variation. Replacing flour, fat, eggs, or dairy can require a different formula rather than a direct swap.

Storage and Serving

Store airtight at room temperature up to 4 days. Freeze individual bars for up to 2 months and thaw wrapped.

Ingredient check: this recipe includes wheat, milk, eggs. Review packaged ingredients for additional allergens and use clean equipment when preparing food for guests.

For similar portions, mark the center of each side before cutting the slab into a grid. Clean the knife between rows rather than pushing accumulated crumbs or filling into every subsequent cut.

FAQ

Can I make this ahead?

Store airtight at room temperature up to 4 days. Prepare any fresh garnish close to serving so it keeps its color and texture.

Which pan or container should I use?

Use the 9-inch square metal pan as written. The depth controls how the mixture sets, so changing the dimensions means you also need to reassess the timing.

What is the most important texture tip?

Level the dough before baking; a thick mound in the center can remain underdone after the edges have browned.

Can I change the flavor?

Replace 1/3 cup chocolate chips with the same volume of chopped toasted pecans for added crunch. Make one small change at a time so it is easier to judge the result.

How do I know it is ready to serve?

Follow the texture cues in the directions and allow the full resting period. A surface that looks ready does not always mean the center is firm enough to cut.

Can I halve or double the recipe?

For a first batch, use the quantities and pan listed. Scaling changes thickness, mixing, and timing; multiplying ingredients alone does not establish a new baking time.

Can I use a smaller square pan?

A smaller pan makes a deeper layer and needs a different bake. Use the nine-inch pan for these quantities so the edges and center have the intended balance.

Sophie Bennett