Can´t go outside? Go to the moon.

Take a baking tray.

Add some flour on it (1 dl or more if you have bigger tray).
Tap the flour even with your hand.

Add spices like peppers, seeds or sprinkles.
If you wish to make some planets, you can take a piece of tin foil and squeeze it into balls.

Take a toy and start playing moon walk!

It takes two minutes to prepare. It takes half an hour to play with. And if the flour stays on the baking tray it takes two minutes to clean. I mean IF it stays on the tray.