I made this today for my daughter and it has kept her entertained longer than any toy she owns. It’s easy to make and there are ways to minimise the mess. I fill a baking tray with high sides to contain the dough and try to keep it at the kitchen table. You can make it more powdery if you like but I find this consistency good because it holds together like wet sand. But it is easier to wash off their hands than sand!
2 cups flour
1/2 cup olive oil
Combine the two ingredients in the tray your child is going to play in (fewer dishes :)) Combining it with your hands is the easiest way. It will still crumble apart but if you mould it it holds together.
I just give my kids some measuring cups, silicon bun cases and plastic cutlery and let them pretend to bake/ make sandcastles. My 5 year old likes this just as much as my 3 year old and I like it even more because of the peace it grants me 🙂