Context: The company's products expanded to include malts and milkshakes in 1950, banana splits in 1951, Dilly Bars in 1955, Mr. Misty slush treats in 1961 (later renamed Misty Slush, then again to Arctic Rush; as of 2017, DQ again calls them Misty Slush, as seen on dairyqueen.com), Jets, Curly Tops, Freezes in 1964, and a range of hamburgers and other cooked foods under the Brazier banner in 1958. In 1971, the Peanut Buster Parfait, consisting of peanuts, hot fudge, and vanilla soft serve, was introduced. In 1995, the Chicken Strip Basket was introduced, consisting of chicken strips, Texas toast (only in the US), fries, and cream gravy (gravy in Canada). Other items include sundaes and the blended coffee drink, the MooLatte.

Question: when did the peanut buster parfait come out?
Steam of consciousness below:
To answer the question, consider the following: In 1971, the Peanut Buster Parfait, consisting of peanuts, hot fudge, and vanilla soft serve, was introduced.
So, the answer is 1971.