From their website :) personally I would use it tho but just not a huge amount!
“However, Quorn's mycoprotein is also high in fibre and low in fat, meaning it can fill your child up without giving them the energy they need. In fact, 100 grams of Quorn mince is equal to the fibre in three cups of broccoli. It’s for this reason that it’s generally recommended to not give Quorn's mycoprotein to children under three years old.”
We grind chickpeas into medium sized crumbs to create the Bolognese in spag Bol, in case that helps give ideas 💡 also can add mushrooms recipe here: https://www.happyveggiekitchen.com/chickpea-bolognese/