1-First Step: Brown the Butter Melt the 1 stick butter over medium heat until it turns golden brown and develops a nutty aroma, which takes about 5-7 minutes. Stir frequently to avoid burning, then remove from heat and let it cool for 10 minutes. This step is crucial as it adds depth to the cookies’ flavor, making them stand out from regular ones.

2-Second Step: Mix the Sugars Once the butter has cooled, whisk in the 1/2 cup plus 2 tablespoons dark brown sugar and 1/4 cup white sugar until fully combined. This creates a smooth base that helps achieve the cookies’ signature chewiness. For a variation, you could try similar mixing techniques from other cookie recipes to experiment with textures.

3-Third Step: Add Flour and Thicken Whisk in the 2 tablespoons bread flour until the mixture thickens and no butter pools remain, about 1 minute. This absorbs excess moisture and improves the dough’s structure, which is great for dietary adaptations like using gluten-free flour. It’s a simple way to enhance lift without complicating the recipe.

4-Fourth Step: Incorporate Eggs and Flavorings Whisk in 1 egg and 1 egg yolk until smooth, then mix in 1 teaspoon vanilla paste and 1/4 teaspoon bourbon whiskey. For vegan options, substitute with flax eggs to keep things plant-based while maintaining the dough’s consistency. This step adds richness and ties all the flavors together seamlessly.

5-Fifth Step: Combine Dry Ingredients In a separate bowl, mix 1/2 cup bread flour, 1/2 cup all-purpose flour, 1/2 teaspoon salt, 1/2 teaspoon baking soda, and 1/8 teaspoon baking powder. Gradually add this to the wet mixture in batches, stirring until just combined to avoid overmixing. This ensures the cookies have the right texture for different preferences.

6-Sixth Step: Fold in Add-Ins Fold in 1/2 cup 70% dark chocolate chunks and gently incorporate 1/3 cup marshmallow fluff, leaving some pockets for gooey surprises. If you’re aiming for low-calorie versions, reduce the chocolate slightly. This step brings the fun elements that make these cookies irresistible.

7-Final Step: Chill, Bake, and Serve Scoop the dough into about 15 balls, chill overnight in the refrigerator, then let sit at room temperature for 30 minutes. Preheat the oven to 350 degrees Fahrenheit, line a tray with parchment, place 5 balls with 2 inches between them, and press extra chocolate chunks on top. Bake for 8 to 10 minutes until slightly underbaked, reshape if needed, sprinkle with salt, and cool before serving for the best chewy results.