Preheat your oven to 325°F (160°C) and line baking sheets with parchment paper.

In a medium saucepan over medium heat, melt butter until golden brown and nutty, about 5-7 minutes. Let cool for 10 minutes.

In a large bowl, combine browned butter with brown sugar and granulated sugar until smooth. Add egg and vanilla, blending until fluffy.

In a separate bowl, whisk together flour, baking soda, and salt. Gradually add to the wet mixture, stirring until just combined.

Fold in chocolate chips and Cadbury mini eggs until evenly distributed.

Drop rounded balls of dough onto prepared baking sheets and bake for about 13 minutes, until edges are set but centers are soft.

Cool on baking sheets for about 5 minutes before transferring to a wire rack.