You can simply make a popped cake from grain.

We introduce SYP Rice Popper of Shinyoung Mechanics. SYP Rice Popper is an equipment designed to make grain cakes and chips using only heat and pressure with 100% natural grain. SYP Rice Popper, which started to be produced in 2007 by Shinyoung Mechanics, has sold more than 3,200 units in 70 countries around the world as of 2020, and uses grain produced in each country and makes various products tailored to local customer’s taste. The main products produced by SYP Rice Popper include rice cake and corn cake. These products are gluten-free cereal products and can be used as substitute for bread. Since the products are healthy, they are sold in supermarkets or organic marts around the world and enjoy high popularity.