Prep your workspace. Line a 12-cup muffin tin with paper or silicone liners. If you don't have a muffin tin, line a baking sheet with parchment paper.
Melt the chocolate mixture. In a microwave-safe bowl, combine the chocolate chips, butterscotch chips (if using), peanut butter, and butter. Microwave in 30-second intervals, stirring between each, until completely melted and smooth. Be careful not to overheat—chocolate can seize and become grainy if it gets too hot.
Add the crunch. Pour the chow mein noodles into the melted chocolate mixture and gently fold them in with a wooden spoon until they're completely coated. The mixture should hold together when pressed but still have visible noodles for that "twiggy" nest look.
Shape into nests. Divide the mixture evenly among the cupcake liners. Using your fingers or the back of a small spoon (dipped in a little cold water to prevent sticking), create an indentation in the center of each to form a nest shape. Don't worry about making them perfect—nests in nature aren't perfectly symmetrical either!
Add the eggs. While the chocolate is still soft, place 2-3 candy eggs in the center of each nest. If you're using the green-tinted coconut "grass," sprinkle a small amount in each nest before adding the eggs.
Chill to set. Refrigerate the nests for about 30 minutes, or until firm.
Optional finishing touch. If desired, drizzle a little melted white chocolate over the nests in a zigzag pattern for added visual interest.
Serve and amaze. Remove the nests from the refrigerator about 10 minutes before serving to take the chill off. Store any leftovers in an airtight container in the refrigerator for up to a week.