To make dough: Beat butter, sugar, egg and vanilla with mixer on medium-high speed until fluffy. Reduce speed to low; beat in flour just until blended.

Divide dough into four equal quarters. On a piece of plastic wrap, roll into an 8-in long rope, loosely wrap plastic wrap around rope. Set rope of wrapped dough into one cardboard holder. Rope will gradually form to the V point of the cardboard. Center skewer lengthwise on rope, press skewer about 1/2 way through dough, remove skewer and repeat with remaining dough.

Leave wrapped ropes on muffin tin; freeze 2 hours or refrigerate overnight until dough is firm enough to slice neatly.

Heat oven to 350F.

Cut one rope at a time, leaving the rest in the refrigerator, into 1/4 in thick hearts. Dip one side in colored sugar. Place 1/2 in apart on ungreased baking sheet. Bake 8-9 minutes or until lightly brown around edges. Remove and cool.