Combine the rolled oats, water or milk, diced apple, cinnamon, and salt in a medium saucepan.
Place the saucepan over medium-high heat. Bring the mixture to a gentle boil, stirring occasionally.
Once boiling, reduce the heat to medium-low to maintain a simmer. Cook for 5 to 7 minutes, stirring frequently. This stirring helps create a creamy oatmeal texture.
Remove the saucepan from the heat. Stir in the maple syrup and vanilla extract.
Let the oatmeal sit, covered, for 1 minute to thicken slightly.
Divide the apple cinnamon oatmeal into bowls. Add your favorite toppings like nuts or a dollop of yogurt. Serve immediately for a cozy breakfast.
Notes
For a gluten-free apple oatmeal, use certified gluten-free rolled oats.
To make this vegan cinnamon oatmeal, use water or plant-based milk instead of dairy milk.
If you prefer a sweeter flavor, add a little more maple syrup or a sprinkle of brown sugar during the last minute of cooking.
For extra protein, stir in one scoop of vanilla protein powder or a spoonful of Greek yogurt after removing it from the heat.