In a skillet, melt the unsalted butter over medium heat. Stir frequently until it bubbles and begins to turn a golden brown, releasing a rich nutty aroma (about 5-7 minutes).

In a mixing bowl, combine the granulated sugar, brown sugar, and the browned butter. Mix until well combined, creating a smooth and glossy texture that hints at the deliciousness to come.

Crack the large egg into the sugar mixture along with the vanilla extract. Mix until everything is beautifully blended, creating a luscious batter that’s hard to resist!

In a separate bowl, whisk together the all-purpose flour, baking soda, and salt. This step ensures your cookies will have the perfect rise and texture.

Gradually add the dry ingredients to the wet mixture, stirring gently until just combined. Aim for a soft dough that holds together but don’t overmix to keep your cookies tender.

If the dough feels too soft, stir in the additional flour, one tablespoon at a time, until it reaches a desired consistency that you can easily scoop.

Using a cookie scoop or spoon, drop dough onto a baking sheet lined with parchment paper. Top each cookie with colorful sprinkles and nonpareils for added flair before baking.

Place in a preheated oven at 350°F and bake until golden brown, about 13 minutes. You'll know they're ready when the edges are set, and the centers look slightly soft.