Measure the base: Add 1/2 cup rolled oats and 1 cup milk (or water) to a small saucepan.
Stir in a pinch of salt and a dash of cinnamon.
Cook the oats: Bring to a gentle simmer over medium heat. Stir occasionally for 3–5 minutes until the oats are soft and the mixture thickens.
Mash the banana: While the oats cook, mash half a ripe banana in a bowl. Slice the other half for topping.
Add banana to the pot: Stir the mashed banana into the oats.
Cook 30–60 seconds to warm it through and sweeten the bowl naturally.
Stir in peanut butter: Remove from heat and add 1–2 tablespoons peanut butter. Mix until creamy and fully incorporated.
Boost the protein: If using protein powder, sprinkle it in gradually while stirring to avoid clumps. If using Greek yogurt, fold it in after the pot has cooled for a minute to prevent curdling.
Adjust sweetness: Taste.
If you want it sweeter, add 1–2 teaspoons honey or maple syrup.
Finish with toppings: Transfer to a bowl and add sliced banana, a few chopped peanuts, or a drizzle of peanut butter for texture.