Mounie hat-trick give Benin warm-up victory
Mounie, whose club were relegated from the English Premier League last season, gave the Squirrels a 1-0 half-time lead in Moroccan city Marrakech.
Moctar el Hacen levelled just after the break from a penalty only for Mounie to score twice more in the final warm-up match for both countries. Benin are in Group F with defending champions Cameroon, Ghana and Guinea-Bissau while Mauritania face Angola, Mali and Tunisia in Group E.
On Monday, a stoppage-time goal from Naim Sliti earned Tunisia a 2-1 win over Burundi near Tunis in another friendly between qualifiers. All the goals came in the second half with Taha Yassine Khenissi giving the home team a 66th-minute lead that Cedric Amissi cancelled.
It was the third Tunisian warm-up success after victories over Iraq and 2018 World Cup runners-up Croatia.
Angola play South Africa and the Ivory Coast meet non-qualifiers Zambia Wednesday in the final warm-up fixtures.
The Cup of Nations kicks off Friday in Cairo with a Group A match between hosts and title favourites Egypt and Zimbabwe.