"Mushroom coffee" refers to a type of coffee that includes medicinal mushrooms mixed with regular coffee or made from mushroom extracts. Full definition
Each box of Mushroom Coffee contains 10 individual packets of instant coffee with 50 mg of caffeine per serving while the tin jar comes with 30 servings. (us.foursigmatic.com)
I've heard about mushroom coffee before but have never really thought much of it. (naturalpaleofamily.com)
They have an amazing instant mushroom coffee... yes! (wellnessmama.com)