Preheat oven to 350ºF.
Prepare a baking sheet by spraying it with cooking spray.
In a large mixing bowl add butter and sugar.
Beat softened butter and sugar together until fluffy.
Add dry jello.
Mix until it is incorporated.
Add eggs and beat again.
Add flour, baking powder, and salt.
Beat well until cookie dough is uniform. Be sure to scrape the sides as needed.
Using a 1 tablespoon cookie scoop or spoon, scoop dough onto your prepare baking sheet.
Roll each ball of dough until it is smooth.
Spray the bottom of a glass with cooking spray and gently flatten each ball of dough.
Place baking sheet inside oven.
Bake for 9-10 minutes or until edges begin to brown.
Allow cookies to cool on pan.