Preheat your oven to 350 degrees F (175 degrees C). This step is crucial for ensuring your cookies bake evenly. While the oven heats, line a large baking sheet with a Silpat baking mat or parchment paper and set it aside.
In a medium bowl, whisk together 3 cups all-purpose flour, 1 1/2 teaspoons baking powder, 1 teaspoon baking soda, and 1 teaspoon sea salt. This mixture should be light and fluffy, setting the stage for the perfect cookie texture.
In a stand mixer, cream together 1 cup unsalted butter and both 1 1/2 cups light brown sugar and 1/2 cup granulated sugar. Mix on medium speed for about 3 minutes until the mixture is light and fluffy. The butter should be at room temperature to ensure a smooth blend.
Add in 2 large eggs and 1 tablespoon vanilla extract to the butter-sugar mixture. Continue mixing until everything is fully combined. The batter should be creamy with a rich aroma.
With the mixer on low, slowly add the dry mixture to the wet ingredients. Mix just until combined. Overmixing can lead to tough cookies, so just blend until you can’t see any flour streaks.
Stir in 2 1/2 cups chocolate chips with a spatula or spoon. These will be the stars of your cookies, adding melty richness to each bite.
Gently fold in 1 1/2 cups sprinkles. You want to ensure they are evenly distributed throughout the dough without breaking them.
Using your hands, form the cookie dough into balls, about 2 tablespoons each. This is a fun step where you can make them as big or small as you like.
Pour the remaining ¾ cup of sprinkles into a small bowl. Roll each cookie dough ball in the sprinkles, making sure to coat the entire surface. This creates that colorful, festive appearance!
Place the coated cookie dough balls on the prepared baking sheet, about 2 inches apart. Optional: sprinkle with extra sea salt for a sweet and salty flavor contrast.
Bake the cookies for 10 to 12 minutes, or until the edges are slightly golden brown. Keep an eye on them to avoid overbaking. The centers might look a little underdone, but they’ll firm up as they cool.
Remove the cookies from the oven and let them cool on the baking sheet for 2 to 3 minutes before transferring them to a wire cooling rack to cool completely. This step is essential for achieving that perfect texture.