A rich, soft, chocolate cookie studded with chopped Cadbury Eggs. Feel free to sub another add-in in place of the eggs if you like. We love this one with chopped PB M&M's, too!
Preheat oven to 350℉. Line a baking sheet with a piece of parchment paper.
Place butter in heat-safe mixing bowl and microwave in 20 second intervals until almost melted. It doesn't need to be completely liquid, just incredibly soft. I usually heat until about half is melted and the other half is super super soft.
Mix sugars into butter thoroughly and then egg yolk and vanilla. Sprinkle in flour, cocoa powder, baking powder, baking soda, and salt and combine everything together. Set aside a tablespoon or so of your chopped candies and mix the rest into the dough.
Pull dough together into a large ball and press down on your baking sheet into a circle that is 6-6.5 inches in diameter.
Bake for 10-12 minutes, looking for crackling edges around the outer edge of the cookie. Cool on baking sheet for a few minutes and then transfer to a cooling rack.
Notes
I'm slowly working to update all of our giant cookie recipes with weighted measurements. We've found when working with such small amounts, even a slight mis-measurement can alter the finished product, so weighing ingredients gives consistent results. If you have a food scale, we recommend you use it for this recipe. If not, no worries- I've provided some tips on how to best measure.
Store in an airtight container at room temperature. Homemade cookies are safe to eat for a week or more when stored this way, but they will definitely have the best taste and texture the first couple days.