In a microwave-safe bowl, combine the oats and water. (You can add a bit of coloring to the water if desired.)
Cook in the microwave for 60 seconds on high. Allow to cool for 5-10 minutes, until it still feels warm to the touch, but is cool enough to handle with your hands.
Add ¼ cup of cornstarch to the cooled oatmeal and work it in with your hands. Once the ingredients are fully combined, add an additional tablespoon of cornstarch and knead that in as well. If the dough still feels sticky, keep working in small quantities of cornstarch until you are satisfied with the texture.
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Notes
1. Storage instructions: This dough has the best consistency when used immediately, but if it is still usable after play, it can be stored in a sealed bag or airtight container in the fridge for up to 5 days. You will need to work in some more cornstarch to get rid of any stickiness that forms due to condensation.2. Making quick oats from rolled oats: This recipe will work best with quick oats, but if you only have rolled oats, you can turn them into quick oats by breaking them down in the food processor using the "Pulse" function.3. Adding coloring: If you wish to add color to the dough, you can add food coloring (or a more natural alternative) to the water before you pour it onto the oats.4. Helpful tips:
Keep an eye on the microwave: Watch the oats while they cook, and if you see them puffing up too much, turn off the microwave early to prevent them from spilling over.
Make it without a microwave: To make this recipe without a microwave, boil the water before adding it to the oats and allow them to soak it up for a couple minutes.
Speed down the cooling process: You can speed up the cooling process by placing the oatmeal in the microwave for a few minutes, but make sure it's still a bit warm when you add the cornstarch and start kneading the dough.
Get the perfect consistency: Adjust the amount of cornstarch as needed to remove any stickiness and achieve the perfect consistency. You may also need to add more during play, especially if the weather is hot and humid.