Chocolate-Mint Marble Cookies
These are especially fun for kids to make--they'll love squishing the dough balls together to make each marble. Cream cheese gives the cookies richness and chewiness. Just make sure both the butter and cream cheese are at room temperature before you start so that they'll incorporate fully into the dough. The food coloring is optional. Omit it if you like-or add more if you prefer a more vibrant green.