Chop the chocolate coating and carefully melt it with coconut oil over a warm water bath. Leave to cool. Cut mice into pieces. Spread a rectangular springform pan (35 x 24 cm) thinly with oil.
Mix chocolate-coated peanuts, confectionery and mice into the cooled couverture. Distribute evenly in the mould. Chill for at least 3 hours. Serve cut into pieces.