Wash, core, and dice your apples into small, bite-sized pieces (approximately ¼-inch cubes). If using Honeycrisp apples, you can leave the skin on; for Granny Smith, peeling is recommended.
In a medium saucepan, melt the butter or coconut oil over medium heat. Add the diced apples and cook for 2-3 minutes until they begin to soften.
Sprinkle the brown sugar, cinnamon, nutmeg, and cloves over the apples, stirring to coat evenly.
Add 2 tablespoons of water to the apple mixture and reduce heat to medium-low. Cover and simmer for about 5 minutes, stirring occasionally, until the apples are tender but still hold their shape.
While the apples are simmering, prepare your oatmeal. In another saucepan, combine the rolled oats, milk, salt, and vanilla extract.
Bring the oatmeal mixture to a gentle boil over medium heat, then reduce to a simmer. Cook for 5-7 minutes, stirring occasionally to prevent sticking, until the oats reach your preferred consistency.
Once both components are ready, swirl the maple syrup or honey into the oatmeal.
Divide the oatmeal between two bowls and top generously with the warm apple pie filling.
Add your choice of optional toppings such as chopped nuts, a sprinkle of cinnamon, a drizzle of maple syrup, or a dollop of Greek yogurt.