Cream together the melted butter and sugar until light and fluffy.
Add the eggs and mix until smooth and creamy.
Add vanilla and mix until well blended.
In a separate bowl add the flour, cornstarch, baking powder, baking soda, and salt. Stir together until completely blended.
Add the flour mixture to the mixing bowl, a little at a time, until all the flour has been added, and mix well.
Remove the mixing bowl from the stand mixer and gently fold in the sprinkles and the crushed Animal cookies.
Drop by tablespoonful onto an un-greased cookie sheet and bake at 350 for 12-14 minutes or until light golden brown.
When cookies are almost done, remove cookie sheet, and place an animal cookie in the center of each cookie. Place cookie sheet back in the oven for 1 minute, then remove cookies to a wire rack to cool.
When cookies are cool, serve, and enjoy!