Prepare the Dough

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone baking mats to prevent sticking.
2. Cream Butter and Sugars: In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy. You can use a hand mixer or stand mixer for this, but it works just as well with a good old-fashioned whisk and some elbow grease.
3. Add the Eggs and Vanilla: Beat in the eggs, one at a time, followed by the vanilla extract. This will help incorporate air into the dough and create a nice texture.
4. Mix the Dry Ingredients: In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing just until combined. You want to avoid overmixing so the cookies stay soft.

Add the Mix-Ins

5. Stir in the Mix-Ins: This is where you get to get creative! Stir in your mix-ins—chocolate chips, pretzels, nuts, dried fruit—whatever you like! Don’t be afraid to go a little overboard. You want these cookies to be chunky and packed with flavor.
6. Chill the Dough (Optional): If you have time, chill the dough for 30 minutes in the refrigerator. This helps the cookies hold their shape better while baking, but you can skip this step if you’re in a rush.

Shape and Bake the Cookies

7. Scoop the Dough: Use a cookie scoop or a tablespoon to portion out the dough into 1 1/2-inch balls. Place them about 2 inches apart on the prepared baking sheets—these cookies will spread a little as they bake.
8. Bake: Bake the cookies in the preheated oven for 10-12 minutes, or until they’re golden around the edges but still soft in the center. They’ll continue to firm up as they cool, so don’t overbake them.
9. Cool: Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.