In a small pot, bring milk to a boil over medium high heat. Meanwhile dice the apple, removing the core and the seeds.

Once milk has come to a boil, add the oatmeal and apples. Stir to combine. Reduce heat to medium and cook for 5 minutes.

Remove oatmeal from heat. Add vanilla extract, yogurt and 1 tablespoon walnuts and stir to combine. Top with remaining walnuts and chocolate chips.

Serve hot or place in refrigerator overnight and serve cold.