Spread 24 of the crackers with peanut butter and top with remaining crackers to make 24 sandwiches. To keep the peanut butter from melting, you can stick the shaped sandwiches in the freezer while you prepare the chocolate.
Put all of your shaped sandwich cookies on a plate in the freezer for about 20 minutes so that they will be cold when you dip or mold them. After 20 minutes, transfer them to a freezer bag and dip as many as you want at a time.
In the top of a double boiler or in a bowl set in or over a skillet of simmering water, melt the chocolate. If using the microwave, melt smaller amounts at a time using 50% power and stirring often. How you melt the chocolate will depend on the type you are using. If using chips, add about 1 teaspoon of coconut oil for every 4 oz.
Put a big spoonful of melted chocolate in the bottom of a mold. Set a sandwich directly in the center, pressing down so that the chocolate flows from the bottom and up around the sides. Spoon more chocolate in the center.
Alternatively, set the sandwiches on a rack set over a lined baking sheet. Spoon melted chocolate over and let it drip down.
Let the chocolate set and room temperature or chill to set quickly. If using sprinkles, add sprinkles or decorations before the chocolate is completely set so that they will stick.