Gather your ingredients. I recommend picking out the peanut/cashew halves that you want to use for ears before you start melting any chocolate.
Pick a color of melting chocolate and melt it according to the package directions. I chose the white melting chocolate to work with first. Place a dab of melted chocolate on one side of the top of the cookie. Press a peanut/cashew into the chocolate. Repeat with the second side. Let sit for a couple of minutes so the chocolate hardens.
Attach ears to all cookies.
Line the cookies up and reheat chocolate if necessary to attach the eyes.
Place 2 small dabs of melted chocolate on the top half of each cookie. Press a googly eye on each dab of chocolate.
Cut the Twizzlers to small pieces that span the lower half of the cookie. Smear one side of the cut Twizzlers with melted chocolate and press the Twizzler onto the cookie for the horse's halter.
Add hair, nostrils and a mouth with whichever color you'd like. We used white chocolate for some of the manes and brown for the others. We used the brown chocolate for the nostrils and mouths.
I used a plastic sandwich bag as a piping bag to draw on the hair and other details!