Melt butterscotch chips in the microwave for about 1 minute to 1 minute 30 seconds. Stir gently until smooth, then add peanut butter, stirring once more.
Add in chow mein noodles and marshmallows and stir to coat.
Drop by rounded tablespoonfuls onto wax paper. Arrange candy eyeballs on one side of each treat. Let cool to set. Store leftovers in an airtight container.
For the purple, white and green Haunted Haystacks, melt 1/3 cup candy melts in a glass bowl (about 30-60 seconds in the microwave) then add 1/2 cup chow mein noodles. Stir to coat, drop by rounded tablespoonfuls onto wax paper. Arrange candy eyeballs on each treat, then let cool to set.
Tip: You can find a variety of candy eyeballs as well as the colored candy melts at craft stores like Michael's, Hobby Lobby, Joann's, etc. You can also find them at Walmart in the cake decorating aisle. Most grocery stores have at least 1 size of candy eyeballs- I loved using the small and large ones for these treats!