They led 7-5 at the break, went 10-5 up when Warwick landed a penalty in the 57th minute and rounded off the night with an excellent try from Tomas O'Leary in the 71st minute.
In an all round team effort O'Lary had a fine game as did his half-back partner Paul Warwick, hooker Denis Fogarty, flanker Niall Ronan, replacement Anthony Horgan while Mick O'Driscoll was excellent in the air and young Billy Holland was one who most certainly caught the eye with a very composed performance on his debut.
The occasion saw the introduction of Rua Tipoki as a 60th minute replacement for the impressive Lifeimi Mafi and the former Maori captain marked his first appearance for Munster with a try saving tackle and then got involved in the move that led to O'Leary's final try.
Munster: M Lawlor; J Kelly (A Horgan 33 min), L Mafi (R Tipoki 60 min), I Dowling; P Warwick (J Manning 65 min), T O'Leary; F Pucciariello (Darragh Hurley 54 min), D Fogarty, T Buckley; D Ryan (M Melbourne 27 min), M O'Driscoll; B Holland, N Ronan, A Foley capt
Saracens: D Scarborough; R Haughton, K Sorrell, A Powell, E Thrower; G Ross, N de Kock; N Lloyd, M Cairns, T Mercey; T Ryder, H Vyvyan; P Gustard, D Seymour, B Skirving.