Fans are baffled by the quirky new all-in-one breakfast drink – and some people say they "can't think of anything worse".
The coffee is blended with a cereal powder made from oat, barley and wheat – three of the ingredients that go into Cheerios.
It is served with vegan oat milk as standard to add to the cereal taste, which is poured over an espresso shot.
It's then topped with crispy shards made from the oat, barley and wheat cereal.
But the drink, which starts at £3.20 for the smallest "short" size and is in all 335 UK Starbucks shops from today, is confusing fans.