• prepare a 1.5lt slow cooker ( don't turn on til all ingredients are in sc)
• mix cake mix as per instructions.
• add oil to cake mix (unless cake mix already calls for oil, don't double up).
• spray sc insert with canola spray and add cake mix.
• chop mars bars into small pieces and sprinkle over cake mix.
• mix mousse as per instructions and dollop half the mix on top of the cake mix and mars pieces.
• cover sc with a tea towel and place lid on top.
• cook on high for 20 minutes then switch to low for 1 hr 40 mins or until cake is cooked through.
• when cooked, run a sharp knife around edges to loosen, place a plate on top of the insert and flip over.

Notes

• Serve hot with left over choc mousse and vanilla ice-cream.
• Be sure to rotate slow cooker if using a 1.5lt to avoid burning due to a hot spot. Rotate every half hour.