Make cookies. Prepare dough following recipe directions. Press into pan cavities filling 2/3 full. Bake and cool according to pan package directions.
Decorate cookies. Prepare royal icing following recipe directions. Tint portions red and rose. Use tip 3 and full-strength rose icing to outline and fill in keyhole. Pat smooth with finger dipped in cornstarch.
Use tip 3 and full-strength red icing to outline heart. Use tip 3 and thinned red icing to fill in heart. Let dry overnight.