Bake cookies. You will need two cookies per treat. Prepare dough and roll out dough 3/16 in. thick. Cut using round Comfort-Grip.
Invert whoopie pie pan and spray with vegetable pan spray. Drape dough over every other pan cavity, pressing to smooth surface. Bake 10-14 minutes, or until firm and golden brown. Cool pan on cooling grid 10 minutes. Carefully loosen bottom edges of pan using spatula.
Fill treats. Fill one cookie with Valentine candy corn.
Make piñata treats. Prepare royal icing. Use tip 8 and icing to pipe a line around rim of candy-filled cookie; attach second cookie. Use tip 8 and white icing to pipe an additional line around edge. Immediately roll in nonpareils.
Decorate heart design. Use pink Sparkle Gel to pipe and fill in heart.