Prep the rhubarb: Rinse and chop rhubarb into small, bite-size pieces. Smaller pieces cook faster and blend better into the oats.
Start the fruit: In a medium saucepan, add rhubarb, ¼ cup water, and 1 tablespoon of the honey or maple.
Cook over medium heat for 3–4 minutes, stirring occasionally, until the rhubarb softens and releases juices.
Add liquids and oats: Pour in the milk and remaining water. Stir in the oats, cinnamon, and a pinch of salt. Bring to a gentle simmer.
Simmer to creamy: Reduce heat to low and cook 6–8 minutes, stirring often, until the oats are tender and the mixture is creamy.
If it gets too thick, add a splash more milk.
Finish the flavor: Stir in the vanilla and remaining honey or maple syrup. Taste and adjust sweetness to your child’s preference.
Boost if you like: For extra fiber and creaminess, stir in chia seeds or ground flax during the last 1–2 minutes of cooking.
Serve warm: Spoon into bowls. Top with yogurt for extra protein and creaminess, then add fruit or nuts if your kid enjoys texture.