Estimated time:
1-2 hours?

Ingredients: (Hit your return key to start a new line)
Use a heart-shaped candy box as a 'cutter'/template for your cookie(s). Line a cookie sheet w/heavy-duty foil, and dust w/flour; roll dough out directly on the cookie sheet. After rolling out the dough, press the inside edge of the box into the dough, like a cutter, and/or use it as a guideline, running a knife around the edge to cut the shape. Remove scraps (they can be re-rolled and cut & baked w/Normal temp. and time).

You'll need a roll of refrigerated cookie dough OR a proven cookie dough recipe.

Follow instructions on the package/recipe for thickness, pan preparation, bake time, etc. You may want that oven temp. slightly lower (about 25 degrees) due to the size of the cookie, for it will need to bake longer than the usual cookies. (If you are using the refrigerated dough, you may find special 'giant cookie' guidelines).

Once baked and cooled, frost and decorate as desired. Candies and sprinkles are fun; you can also write messages on them (like giant conversation hearts). If you are icing-challenged in writing, maybe the candy letters (the kind used on cake tops) would work.

Other suggestions and comments:
It just always seems to me that there should be some sort of use for those Cool candy boxes, and I have finally found one!

The box can be stored wrapped in plastic, to keep it dust-free until use, but will probably only be good for one baking session ;-)

Hearts say "I love you" any time of year.

Additionally, the use of green frosting on 3 heart shapes creates a 'shamrock' shape for St. Patrick's Day!