Measure and prep. Grate the apple (including the skin for extra fiber and color unless you prefer to peel). Measure the oats and milk and have the cinnamon, maple syrup and almonds ready. Prepping mise en place keeps the cooking smooth and prevents overcooking the oats.

Toast the almonds: place the chopped almonds in a small dry skillet over medium heat and toast, shaking the pan or stirring frequently, until fragrant and just golden (about 2–3 minutes). Transfer to a small bowl to stop cooking. Toasting concentrates the almond oils and aroma, giving a more complex, restaurant-quality crunch.

Combine oats and milk in a medium saucepan and add a pinch of salt. Bring to a gentle simmer over medium heat, stirring occasionally. Starting the oats and milk together lets the oats hydrate evenly and prevents sudden thickening that causes lumps.

Add the grated apple and cinnamon to the pan once the milk barely simmers. Reduce heat to low and continue to cook, stirring every 30 seconds to 1 minute, for about 8–10 minutes until the oats are tender and the mixture has thickened. The grated apple will break down as it cooks and release natural sugars and pectin, creating a silky, slightly jammy texture that infuses the oats with apple flavor without large chunks.

Check texture and finish: when the porridge is creamy and the oats are cooked to your liking, remove from heat. Stir in the maple syrup and vanilla (if using). Taste and adjust: add a touch more salt if needed — a tiny amount of salt brightens sweetness and deepens flavor. If the porridge is too thick, stir in a splash of warm milk until you reach the desired creaminess.

Serve: divide the porridge between two bowls. Scatter the toasted almonds on top and dust with an extra pinch of cinnamon if you like. For a restaurant finish, add a small drizzle of maple syrup and a sliver of butter (optional) for gloss and richness. Serve immediately while warm; porridge firms as it cools.

Storage and reheating note: let leftover porridge cool to room temperature, then store in an airtight container in the fridge for up to 3 days. To reheat, warm gently in a small saucepan with a splash of milk, stirring to restore creaminess. Reheating slowly prevents scorching and keeps the texture smooth.