‘Weeknight staple’: Just 4 ingredients. I don’t even glance at a recipe anymore.

Chocolate chip cookie bars are the weeknight shortcut to classic chocolate chip cookies—same flavor, far less fuss. Instead of portioning and rotating trays of individual cookies, the dough is pressed into a single pan and baked all at once, which is why bars became popular in American home kitchens in the mid-20th century, right alongside casseroles and sheet cakes. This version pares the formula down to just four ingredients, relying on sweetened condensed milk for both sweetness and structure, and melted butter for richness. You get that familiar toffee‑edge chew and soft center with a fraction of the effort, making these ideal for last‑minute potlucks, school events, or those evenings when you want homemade dessert without a sink full of dishes.

These cookie bars are rich and sweet, so they pair well with something cool and a bit lighter. Vanilla or coffee ice cream is the classic choice, but a spoonful of lightly sweetened whipped cream and a handful of fresh berries will keep the plate from feeling too heavy. If you’re serving a crowd, set out a small dessert board with sliced fruit, roasted nuts, and a bit of dark chocolate to contrast the bars’ sweetness. For beverages, coffee, black tea, or an unsweetened iced tea balance the condensed milk’s richness nicely, while a small glass of cold milk keeps things traditional and kid‑friendly.

Servings: 12 bars

1/2 cup (1 stick, 113 g) unsalted butter, melted and slightly cooled

Preheat your oven to 350°F (175°C). Line an 8×8-inch (20×20 cm) baking pan with parchment paper, leaving a bit of overhang on two sides to help lift the bars out later. Lightly grease the parchment and any exposed pan edges.

In a medium mixing bowl, whisk together the melted, slightly cooled butter and the sweetened condensed milk until the mixture looks smooth and uniform. The condensed milk acts as both your sugar and part of your liquid here, so you’re essentially building a simple, enriched base.

Add the all-purpose flour to the bowl and stir with a spatula or wooden spoon just until no dry streaks remain. The dough will be thick—closer to a soft cookie dough than a pourable batter. Avoid overmixing, which can make the bars a bit tough once baked.

Fold in the chocolate chips, reserving a small handful if you’d like to sprinkle some on top for a more bakery-style look. Make sure the chips are evenly distributed so each bar gets a good amount of chocolate.

Transfer the dough to the prepared pan. Use a spatula or your fingertips (lightly dampened or greased) to press it into an even layer, reaching all four corners. If you reserved extra chocolate chips, scatter them over the top and gently press them into the surface.

Bake in the preheated oven for 22–28 minutes, or until the edges are golden brown, the top looks set, and a toothpick inserted near the center comes out with a few moist crumbs but no wet batter. Remember that condensed milk–based bars will firm up as they cool, so don’t wait for the center to be completely dry.