1 12-ounce bag butterscotch chips

1/2 cup creamy peanut butter (I like Skippy)

1/2 cup (1 stick) unsalted butter, cut into tablespoon-size pieces

1/2 teaspoon pure vanilla extract

1/8 teaspoon salt (fine sea salt or table salt)

2 1/2 cups mini marshmallows, divided

3/4 cup salted peanuts, divided (do not chop)