• Cream butter and sugar together for about 2 minutes with an electric mixer.
• Add Jello and continue to mix for 1-2 minutes. 
• Add eggs and mix well.
• Mix flour, baking powder and salt together in a separate bowl and then add to the Jello mixture. Mix just until thoroughly combined. 
• If rolling into ball, scoop the dough out by tablespoons and roll into smooth balls. Place on prepared cookie sheet. Spray the bottom of a measuring cup with cooking spray and then press the measuring cup onto a plate with a thin layer of sugar on it. Press each cookie ball with the bottom of the measuring cup, dipping into the sugar in between each cookie. 
• If making cut-out cookies, chill the dough for at least 2 hours. Divide in half and roll out each half to about 1/4" thick. Cut out shapes and place on a prepared cookie sheet.
• Bake cookies at 375° for 8-9 minutes. 
• Let cool and then add frosting if desired. 

FROSTING

• Mix butter, sour cream, 2 cups powdered sugar, 1 tsp vanilla and reserved Jello power with an electric mixer until smooth. Add milk 1/2 Tbsp at a time until the mixture reaches desired consistency.