01 -
In a stand mixer fitted with a paddle attachment, cream the unsalted butter with granulated and brown sugars on medium-high speed for 5 minutes until light and fluffy.
02 -
Add eggs one at a time, beating well after each addition. Pour in the vanilla extract and continue mixing for 1 more minute.
03 -
Sift together all-purpose flour, cornstarch, salt, baking soda, and baking powder. Gradually add this mixture to the wet ingredients on low speed until just combined.
04 -
Using a spatula, gently fold the semi-sweet chocolate chips and Easter sprinkles into the dough until evenly distributed.
05 -
Using a 4-ounce (113 g) scoop, portion the dough into 8 even rounds. Flatten each dough round, place one Peep marshmallow in the center, then carefully wrap the dough around to fully enclose the marshmallow.
06 -
Refrigerate the stuffed dough balls for at least 2 hours, up to 48 hours, to prevent spreading during baking.
07 -
Preheat the oven to 375°F (190°C). Line baking sheets with parchment paper.
08 -
Place 4 cookies on each prepared sheet and bake for 14 to 16 minutes until edges turn golden brown.
09 -
Allow the cookies to cool on the baking sheet for 20 to 30 minutes so the marshmallow center can set before transferring.