Kahlua Chocolate Nut Squares

These bars run a coffee liqueur double-play: a quarter cup folded into a brown sugar batter, plus another splash brushed onto the warm top so the alcohol sinks in while the crumb is still thirsty. The result is a dense, fudgy chocolate square with walnuts for crunch and a boozy backbone that keeps these from tasting like every other school-fundraiser blondie.

The icing is where home cooks usually drop the ball. Don’t rush the butter. Let it foam, then keep going until the milk solids turn the color of toasted hazelnuts and smell nutty, not burnt. That brown butter is the difference between a flat sugar glaze and an icing with actual depth.

Watch the bake closely. The top should spring back when pressed lightly in the center, which usually lands right at the 30-minute mark. Pull these one minute too late and you lose the fudgy middle.

Kitchen Tips

• Cool the bars completely before icing. Warm bars will melt the powdered sugar glaze into a soupy mess.
• Brown the butter in a light-colored saucepan so you can actually see the color shift.
• Swap the walnuts for pecans if you want a softer, sweeter crunch.
• These freeze well unfrosted, wrapped tight, for up to three months.

Variations

• Trade Kahlua for Baileys for a creamier, vanilla-forward bar.
• Stir in a teaspoon of espresso powder with the flour to intensify the coffee notes.
• Swap half the chocolate chips for chopped dark chocolate for a more bittersweet edge.