In a medium saucepan over medium heat, melt the butter and stir constantly. It will foam, then sizzle, then develop brown bits at the bottom. Once it smells nutty and is golden brown, remove from heat and let cool for 10-15 minutes.
1 cup unsalted butter
In a medium bowl, whisk together flour, baking soda, and salt. Set aside.
2 & ⅔ cups all-purpose flour, 1 teaspoon baking soda, ¾ teaspoon salt
In a large mixing bowl, combine the cooled-down browned butter (make sure it’s not too hot), granulated sugar, brown sugar, and vanilla. Mix until smooth and glossy. Add in the eggs and mix until combined.
⅔ cup granulated sugar, ¾ cup packed light brown sugar, 2 teaspoons vanilla extract, 2 large eggs
Stir the dry ingredients into the wet mixture until just combined.
Add chocolate chips, pastel M&M’s, and crushed Cadbury mini eggs. Fold gently to distribute. Cover the bowl and chill in the fridge for 30-60 minutes.
⅔ cup semi-sweet chocolate chips, ½ cup pastel Easter M&M’s, ½ cup crushed Cadbury Mini Eggs
While the cookie dough is chilling, preheat your oven to 350°F. Spray or line a 13.8x10 jelly roll pan with parchment paper.
Spread the dough evenly into the prepared pan. If you want, you can reserve a few M&M’s and chocolate chips to press on top for a prettier look.
Bake for 18–22 minutes, or until the edges are golden brown and the center looks just set (don’t overbake!).
As soon as the bars come out of the oven and while they're still hot, gently press the halved crème-filled Cadbury eggs on top. They’ll adhere from the heat without fully melting. Let the bars cool completely before cutting.
8-12 Cadbury crème-filled mini eggs