2 cups of plain flour, 1 cup of salt, 1 tablespoon cooking oil, 1 cup water, a drop or two of food colouring if you like. Mix dry stuff together then wet stuff. Mix and knead. Leave in fridge for an hour ideally. You may need to spread extra flour on the table if a bit sticky to start with.
I just use an average size mug and add a bit of flour during the kneading and'or on the table forthe kids if it's too sticky. It always comes out just fine and masterpieces can be baked slowly in the oven, cooled and painted too.