Take an Oreo and carefully twist it to separate the top from the bottom. Spoon 1/2 tablespoon of chocolate chip cookie dough on top of the bottom cookie. Top with the top, and press down slightly to secure the sandwich. Repeat with the rest of the cookies.
Melt chocolate in the microwave, and dip each cookie-dough-stuffed Oreo completely in the chocolate. Use a fork to remove the cookie, and let the excess chocolate drip off. Place on a wax-paper-lined baking sheet, and repeat process with the rest of the cookies. Garnish with sprinkles if desired. Let the chocolate harden before serving.