Steps
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Brown the butter in a light-colored saucepan over medium heat, swirling occasionally, until the milk solids turn deep golden and the butter smells richly nutty, about 5-6 minutes. Pour the browned butter into a large bowl and let it cool for 10 minutes — it should be warm but not hot.
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Add the coconut sugar to the warm browned butter and whisk vigorously until fully combined and slightly thickened. Beat in the egg, egg yolk, and vanilla extract until the mixture is smooth and glossy, about 1 minute of whisking.
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In a separate bowl, whisk together the oat flour, baking soda, and sea salt. Fold the dry ingredients into the wet ingredients until just combined. Gently fold in the dark chocolate chunks. Cover the bowl tightly and refrigerate the dough for at least 1 hour, or up to 72 hours. This step is essential — do not skip it.
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When ready to bake, preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper. Scoop the dough into large balls, about 3 tablespoons each, and place them 3 inches apart on the sheet. Do not flatten them. Press a few extra chocolate chunks into the tops and sprinkle generously with flaky sea salt. Bake for 11-13 minutes until the edges are set and golden but the centers look puffy and slightly underdone. Let the cookies cool on the baking sheet for at least 10 minutes — they will sink and crinkle as they cool, creating that signature thick-cookie texture.
Why It Works
Browning the butter is the foundation of this recipe — the Maillard reaction converts milk solids into hundreds of new flavor compounds with deep caramel, toffee, and hazelnut notes. This single technique delivers a complexity of flavor that commercial bakery cookies try to replicate with artificial flavorings and additives. The extra egg yolk adds lecithin and fat, creating a fudgy, dense center without needing any gums or stabilizers. Coconut sugar dissolves smoothly into the warm butter and brings its own caramel flavor along with trace minerals like potassium, zinc, and iron. Chilling the dough is non-negotiable — it allows the oat flour to fully hydrate, concentrates the sugars, and prevents the cookies from spreading flat. Roughly chopped dark chocolate (85%+ cacao) creates pockets of melted and solid chocolate throughout, while providing magnesium and antioxidant flavanols. Flaky sea salt on top delivers essential trace minerals and creates a sweet-salty contrast that makes these cookies genuinely addictive.
Tips
- Do not skip the chill. The long rest in the fridge is what makes these cookies thick instead of flat. If you are short on time, freeze the dough balls for 20 minutes as a minimum.
- Underbake on purpose. Pull the cookies when they still look slightly underdone in the center. They will continue to cook on the hot baking sheet for several minutes. Overbaking is the enemy of a thick, fudgy cookie.
- Chop your own chocolate. Do not use uniform chocolate chips — they contain stabilizers that prevent proper melting. Chopping a chocolate bar creates irregular chunks that melt into gorgeous pools and create varied texture in every bite.
