Sensory bins are one of my favorite play activities with the kids. There are a lot of ways to do these, but an oatmeal box is probably one of the most simple, easy ways.
Simply fill a large plastic bin with oatmeal, then add measuring cups, spoons, little bowls and more. Step back and watch as your little ones pour, fill, spoon, scoop and play with oatmeal. I enjoy sensory bins because they usually lead to a longer, focused play time.
To avoid too much mess, do this activity on the kitchen floor and just sweep it up when done. Or do it outside.