Delicious Variations

Dark Chocolate Sea Salt

Use chopped 60–70% dark chocolate and finish the bars with flaky sea salt.

The slight bitterness balances the sweetness especially well.

Triple Chocolate

Use a combination of dark, milk, and white chocolate chunks.

Different chocolates melt at different rates, creating a varied texture throughout each bar.

Toasted Pecan

Fold in about ½ cup chopped toasted pecans with the chocolate.

Their buttery flavor works beautifully with brown butter.

Walnut Chocolate Chip

Add ½ cup chopped toasted walnuts for a classic chocolate chip cookie combination.

Toffee Brown Butter Bars

Fold approximately ½ cup toffee bits into the dough.

The caramelized toffee intensifies the toasted flavors of the browned butter.

Peanut Butter Chocolate

Lightly swirl approximately ⅓ cup creamy peanut butter across the surface before baking.

Avoid completely mixing it into the dough so distinct peanut butter pockets remain.

Milk Chocolate Version

Swap semisweet chocolate for milk chocolate if you prefer a sweeter, softer chocolate flavor.

Frequently Asked Questions

Why Do My Bars Look Underdone When I Take Them Out?

Because they should.

For soft, gooey cookie bars, the center should still appear slightly underbaked when the pan leaves the oven.

The bars continue setting from residual heat.

If there is actual wet raw batter, they need more time. But a soft center accompanied by moist crumbs on a toothpick is exactly right.

What Does Milk Powder Do?

Milk powder adds additional dairy solids without adding liquid.

That gives the bars more richness and subtly improves their tender, melt-in-your-mouth texture.

It also complements the flavor of browned butter extremely well.

Use full-fat milk powder when available.

If you cannot find it, simply omit it rather than substituting coffee creamer or tea whitener.

Do the Bars Taste Like Coffee?

No.

The small amount of instant coffee or espresso powder is there primarily to enhance the chocolate.

Most people will not identify an actual coffee flavor.

If you dislike coffee or do not have any on hand, simply leave it out.

Chocolate Chunks or Chocolate Chips?

Both work, but chocolate chunks produce a more dramatic result.

Standard chocolate chips contain ingredients designed to help them maintain their shape during baking.

Chopped chocolate melts more irregularly, creating large glossy pools throughout the bars.

For the best of both worlds, you can use a combination.

Can I Make These Ahead?

Absolutely.

These cookie bars are arguably even better the following day after the center has completely settled and the brown butter flavor has had more time to develop.

Store them in an airtight container at room temperature.

What Size Pan Should I Use?

An 8 x 8-inch metal pan is ideal for thick, fudgy bars.

A 9 x 9-inch pan also works, but the cookie layer will be thinner and generally bake a few minutes faster.

Avoid substantially larger pans unless you intentionally want thin cookie bars.

Can I Use Salted Butter?

Yes.

If using salted butter, reduce or omit the added salt according to how salty your butter is.