Place the mold on a flat surface or baking tray so it stays steady while filling.
Melt the white chocolate according to the package directions until smooth.
Stir in the patriotic nonpareils a little at a time until you reach your desired sprinkle amount.
Fill each mold cavity about one-third of the way with melted chocolate. Place one Firecracker Pop Oreo into each mold, then cover completely with more melted chocolate.
Tap the mold lightly on the counter to remove any air bubbles and help the chocolate settle evenly.
Refrigerate for at least 30 minutes, or until fully firm.
Carefully remove the Oreos from the mold. If they are sticking, chill them longer before trying again. You can also gently press on the back of each mold cavity to help release them.
Let the chocolate-covered Oreos sit at room temperature for a few minutes before serving for the best texture.