Preheat and Prepare: Preheat the oven to 350°F (175°C) and grease a 9-inch pie plate or springform pan.
Mix Wet Ingredients: In a large bowl, whisk together the melted butter, brown sugar, and granulated sugar. Add the egg and vanilla extract, mixing well.
Combine Dry Ingredients: In another bowl, whisk together the flour, baking soda, and salt. Gradually add this to the wet mixture, stirring until just combined.
Add Mix-ins: Fold in chocolate chips and ½ cup of the Easter candies, reserving the rest for topping.
Bake: Spread the dough evenly in the prepared pan. Bake for 25 minutes, or until the edges are golden brown and the center is just set.
Decorate & Cool: Press the remaining Easter candies into the warm cookie cake for a festive look. Let it cool for 30 minutes before slicing.