To make room on the 40-man roster, OF Darrell Ceciliani was promoted to the major leagues and put on the 60-day disabled list.
Stauffer posted a 4-1 record with a 2.48 ERA over 54 1/3 innings for Triple-A Las Vegas, where he was assigned after being signed by the Mets on August 1. Stauffer was released by the Twins in June.
With Las Vegas, Stauffer struck out 35 batters, while walking 10 in eight games (all starts).
Stauffer posted a 6.60 ERA and 2.067 WHIP over 15 innings with the Twins earlier this season.