Preheat the oven to 350 degree Fahrenheit, then line two large baking sheets with parchment paper. Pour the flour, cinnamon, nutmeg, baking soda, and salt in a large mixing bowl, mix until it is combined, and stir in the old-fashioned rolled oats. Leave it aside.
Beat the butter, brown sugar, and granulated sugar together using a mixer for 1 to 2 minutes or until it is well combined. Then mix in the egg and vanilla extract, add the dry ingredients to the wet ingredients, mix until just combined. Fold in the chopped apple gently until it is well infused into the cookie dough.
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