Start with a basic rolled sugar cookie recipe. Roll out the dough (1/8" thick) and cut out three full hearts for each cookie stack. Before baking, cut out a smaller heart from one of the three hearts you have. While baking the cookies make royal icing. Divide royal icing and dyed it. (I did seven colors. For the face of the cookie I used pink, purple, blue green, yellow, and orange and for the writing I used red.) Also, during this time, opened all the small boxes of conversation hearts and pour them into a bowl. (Next year I will look to see if they sell them in bulk.)
When all the basics are made, ice half of the full hearts with a color, let them dry and then write on each. While those are drying, take the blank hearts without the cut outs and lay them out. Take a heart with a cut out and on one side, ice a line around the back side, then adhered to a blank heart without the cut out and press gently. Repeat with the rest of the cut outs.
When the bottom 2/3rd of the stacks are complete and cry, fill them with the conversation hearts. (I found that 7-9 hearts were sufficient.) Make sure your conversation hearts are not too thick or the top cookie will not close. (I used Sweethearts and my cookie dough is rolled to 1/8" thick and it all fit perfectly.) This is important, because part of the fun of this cookie is from the anticipation when you shake it, you can hear something rattling inside. If the candy is too thick or if there are too many, you will miss out on this part of the excitement.
When all of the previous icing steps are dry, ice a line on the other face of the cut out heart, while that icing is wet, top the stack with a heart cookie that is decorated as a conversation heart, press gently and let dry.
Viola! Conversation hearts in a conversation heart cookie. Enjoy.
Until Next Time,
Blair