Crush the Cadbury Mini Eggs
Place Cadbury mini eggs in a zip‑lock bag; gently crush with a rolling pin or mallet into coarse pieces — a mix of small shards and larger chunks for the best texture.
Reserve about ⅓ cup of crushed pieces for pressing on top of cookies before baking.
Mix the Dry Ingredients
In a medium bowl, whisk together flour, baking soda, baking powder, and salt. Set aside.
Cream Butter and Sugars
In a large mixing bowl (or bowl of a stand mixer with paddle attachment), beat softened butter, brown sugar, and granulated sugar together 2–3 minutes until light and fluffy.
Scrape down the sides of the bowl.
Add Wet Ingredients
Add eggs one at a time, mixing well after each.
Mix in vanilla extract until fully combined.
Add Dry Ingredients
Gradually add dry ingredients to the wet mixture on low speed; mix until just combined — stop as soon as no flour streaks remain.
Do not overmix.
Fold in Chocolate and Cadbury Eggs
Gently fold in chocolate chips and the larger portion of crushed Cadbury mini eggs using a spatula.
Mix just until evenly distributed; avoid overworking the dough.
Chill the Dough
Cover dough with plastic wrap; refrigerate at least 30 minutes (up to overnight).
Chilling prevents excessive spreading and helps keep mini egg pieces intact and crunchy.
Preheat and Scoop
Preheat oven to 350°F (175°C).
Line baking sheets with parchment paper.
Scoop dough into balls using a 2‑tbsp cookie scoop; place 3 inches apart on prepared baking sheet (about 8 cookies per tray).
Press Cadbury Eggs on Top
Press the reserved crushed Cadbury mini egg pieces generously onto the tops of each dough ball for extra color, crunch, and a festive look.
Bake
Bake 10–12 minutes until edges are golden brown and the centers look almost set but slightly underdone.
Do not overbake — cookies firm up as they cool.
Cool and Serve
Let cookies cool on the baking sheet 1–2 minutes, then transfer to a wire cooling rack.
For perfectly round cookies, use a large round cookie cutter or glass to gently "scoot" the edges of warm cookies into a circle immediately after baking.