📖 Instructions

1. **Prep Your Workspace and Oven**: First things first, preheat your oven to 375°F (190°C). Line two large baking sheets with parchment paper. This helps prevent sticking and makes cleanup a breeze, ensuring your cookies slide off easily.
2. **Cream Butter and Sugars**: In your large mixing bowl, using an electric mixer (either a stand mixer with a paddle attachment or a hand-held mixer), cream together the softened unsalted butter, granulated sugar, and light brown sugar on medium speed. Beat them until the mixture becomes wonderfully light, fluffy, and noticeably pale, which usually takes about 2-3 minutes. This step is crucial for incorporating air, which contributes to that tender, chewy texture we all love, so don't rush it!
3. **Incorporate Eggs and Vanilla**: Crack in the large egg and egg yolk, one at a time, mixing well after each addition. The extra egg yolk adds richness and chewiness to the cookies. Stir in the pure vanilla extract. Continue to beat on medium speed until everything is fully combined and smooth, making sure to scrape down the sides of the bowl with a rubber spatula as needed to ensure all ingredients are incorporated.
4. **Whisk Dry Ingredients**: In a separate medium-sized bowl, whisk together the all-purpose flour, baking soda, and the 1/4 teaspoon of flaky sea salt. Whisking ensures these dry ingredients are evenly distributed throughout the dough, which helps your cookies rise consistently and prevents pockets of unmixed baking soda.
5. **Combine Wet and Dry**: Gradually add the whisked dry ingredients to the wet ingredients in the large mixing bowl. Mix on low speed *just* until everything is combined. Be super careful not to overmix here! Overmixing can develop the gluten too much, leading to tough, dense cookies. The dough should still look a little shaggy, not perfectly smooth or uniform, when you stop mixing.
6. **Fold in Chocolate Chips**: Take your chocolate chips (or if you're feeling fancy, chopped chocolate chunks for larger melty puddles!) and gently fold them into the dough with a rubber spatula. Make sure they’re distributed throughout the dough, getting those delightful pockets of chocolate in every single bite.
7. **Scoop and Arrange**: Using a 1.5 to 2-tablespoon cookie scoop (or just two spoons, shaping them by hand), drop rounded balls of cookie dough onto your prepared baking sheets. Make sure to leave about 2 inches of space between each cookie, as they will spread quite a bit during baking. If you want those perfectly round, bakery-style cookies, you can gently reshape any oddly formed dough balls with your fingers before baking.
8. **Add the Sparkle**: This is the fun part that makes these cookies special! Lightly sprinkle a little extra flaky sea salt (the 1/2 teaspoon for topping) directly on top of each cookie dough ball. This isn't just for show; that touch of salt beautifully enhances the chocolate's flavor and cuts through the sweetness, so don't skip it!
9. **Bake to Golden Perfection**: Pop one baking sheet into the preheated oven. Bake for 10-12 minutes. You're looking for cookies that have golden-brown edges but are still slightly soft, puffy, and underbaked in the center. Remember, they'll continue to cook a bit on the hot baking sheet even after you take them out, firming up as they cool.
10. **Cool and Repeat**: Let the baked cookies cool on the baking sheet for about 5 minutes before carefully transferring them to a wire cooling rack to cool completely. This crucial step prevents them from breaking apart and ensures they achieve a perfect chewy-crispy texture. Repeat with the second batch of dough. Try not to eat them all straight off the tray, though I know it's hard!