In a mixing bowl, beat marshmallow creme, peanut butter and butter until smooth. Fold in noodles and M & M's. Chill until easy to handle. On waxed paper, form mixture by 1/3 cupfuls into 3" nests. Chill for 30 minutes. Dust with powdered sugar. Place several peanut M & M's in each nest.
Or, instead of forming into nests, chop pastel M & M's slightly and drop by teaspoonfuls onto waxed paper. Omit peanut M & M's.
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