If you're a fan of popular food collaborations, you may consider this the mother of all mash ups: McDonald's new Nutella burger.

While the fast food giant is reportedly experimenting with several new concepts at select global locations, according to Fox News it looks like the chocolate burger pastry being trialled in Italy has hit a particular sweet spot.

The dessert burger, called a "Sweety with Nutella", could be mistaken for a hamburger, except that in place of meat, sauce and pickles it boasts a layer of chocolate-hazelnut spread baked into the bun.

Served warm at McCafe branded stores in Italy, fans have taken to Twitter to express their delight over the creation.

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Whether the product will come to other McDonald's locations is yet to be announced.