📖 Instructions

1. **Step 1: Get Your Butter Ready (And Your Oven Too!)** First things first, pull your unsalted butter out of the fridge about 30-60 minutes before you plan to bake. You want it softened, but not melted – it should yield slightly when you poke it. While the butter is doing its thing, go ahead and preheat your oven to 375°F (190°C). Line two large baking sheets with parchment paper; this prevents sticking and helps with even baking. Don't skip the parchment, it makes cleanup a breeze!
2. **Step 2: Cream It Up!** In your large mixing bowl, either with an electric stand mixer fitted with the paddle attachment or a hand mixer, cream together the softened butter, granulated sugar, and light brown sugar. Beat on medium speed for about 3-4 minutes. You're aiming for a mixture that's light in color and fluffy in texture. This step is crucial, as it incorporates air into the butter, which contributes to the cookies' soft, chewy texture. Scrape down the sides of the bowl often!
3. **Step 3: Egg-cellent Additions** Now, add the large egg and the extra egg yolk to the creamed butter mixture. Beat for another minute until everything is well combined and looks smooth. Then, stir in the vanilla extract. Make sure it's *good quality* vanilla – it really does make a difference in the flavor of your cookies. Don't overmix here, just get it all incorporated.
4. **Step 4: Dry Meets Wet** In a separate, medium-sized bowl, whisk together your all-purpose flour, baking soda, and salt. Give it a good whisk for about 30 seconds to ensure the leavening agent and salt are evenly distributed throughout the flour. This prevents any weird pockets of salt or bicarbonate of soda in your final cookies.
5. **Step 5: Combine with Care** Gradually add the dry ingredients to the wet ingredients, mixing on low speed until just combined. As soon as you no longer see streaks of dry flour, stop mixing! Overmixing develops the gluten too much, and we want soft, tender cookies, not tough ones. A few small lumps are perfectly fine.
6. **Step 6: Chocolate Time!** Fold in your chocolate chips and any chopped chocolate chunks using a rubber spatula. Mix just until the chocolate is evenly distributed. Don't be shy with the chocolate; that's half the fun, right? If you want really visible chocolate puddles, try reserving a handful of chips to press into the tops of the cookie dough balls before baking.
7. **Step 7: Chill Out, Cookie Dough!** This step is *optional* but highly recommended if you have the time. Cover your bowl of cookie dough with plastic wrap and chill it in the refrigerator for at least 30 minutes, or even up to 24 hours. Chilling helps to prevent the cookies from spreading too much, deepens their flavor, and makes for a chewier texture. If you're in a hurry, you can skip it, but I promise the extra wait is worth it!
8. **Step 8: Scoop and Space** Using a medium cookie scoop (about 1.5-2 tablespoons), scoop mounds of dough onto your prepared baking sheets, leaving about 2 inches between each cookie. These cookies will spread a bit, so give them room. I usually fit 9 cookies per standard baking sheet. If you chilled your dough, it might be a bit harder to scoop, but the result will be better!
9. **Step 9: Bake to Perfection** Bake one sheet at a time in your preheated oven for 9-12 minutes. The exact time will depend on your oven and your desired level of 'doneness'. You want the edges to be golden brown, but the centers should still look slightly soft and puffed, maybe even a little underdone. Remember, cookies continue to cook for a few minutes after you take them out of the oven. This is the key to that soft center!
10. **Step 10: Cool Down** As soon as you pull the cookies from the oven, let them cool on the baking sheet for about 5 minutes. They are very delicate when hot, so this brief cooling period allows them to set up. After 5 minutes, carefully transfer them to a wire cooling rack to cool completely. Or, if you're like me, eat one (or two!) while they're still warm and gooey. Pure heaven! Enjoy your perfectly soft and chewy chocolate chip cookies!