Fudgy Chocolate Chip Cookies

These aren’t your typical chocolate chip cookies. A full cup of chocolate chips gets melted with butter and stirred into the batter, creating a fudgy, brownie-like base that’s loaded with even more chips and chopped walnuts on top of that. Double chocolate and then some.

The sneaky technique here is the quick-soured milk: regular milk mixed with a teaspoon of lemon juice and left to thicken for a moment. This creates a homemade buttermilk substitute that reacts with the baking soda, giving the cookies a slight lift while keeping them dense and chewy rather than cakey.

Chilling the dough before scooping is a must. The melted chocolate makes this batter quite soft at room temperature, and warm dough will spread into flat puddles on the baking sheet instead of holding its shape into thick, fudgy rounds.

Pro Tips

• Melt the chocolate chips and butter over low heat, stirring constantly. Chocolate scorches fast, and burnt chocolate tastes bitter.
• Let the melted chocolate cool slightly before mixing into the egg and sugar. Hot chocolate can cook the egg and create lumps.
• Drop by teaspoonfuls, not tablespoons. These are rich, and smaller cookies bake more evenly in the short 8-10 minute window.
• Pull them from the oven while they still look slightly underdone. They firm up as they cool and stay fudgy inside.

Variations

• Use dark chocolate chips for a more intense, less sweet cookie.
• Swap walnuts for pecans or leave them out entirely for a nut-free version.
• Add a pinch of espresso powder to the melted chocolate for a mocha depth that intensifies the chocolate flavor.