
Preheat oven to 375F. In an 8x8 pyrex dish, or similar, place the chicken breasts. Add the garlic, oregano, lemon zest, lemon juice, avocado oil, salt, and pepper on top. With some tongs, flip the chicken and move it around so that all the ingredients are coating the chicken. Allow the chicken to sit for about 20 minutes before placing it into the preheated oven.
Bake for 30 minutes or check the temperature with a meat thermometer and remove when the chicken reaches an internal temperature of 165F. If you cut into the chicken and the juices run clear then it is fully cooked.
Let the chicken cool for at least 20 minutes.
Cover and place into the fridge for a few hours until completely chilled. You can also put it in the freezer for about 40 minutes if you are in a hurry. You need it to be quite cold in order to slice it nicely for sandwiches.
Remove from the fridge and, using a very sharp knife, slice the chicken against the grain.
This chicken can be kept in an airtight container in the fridge for up to 5 days. Alternatively, you can freeze it for at least 3 months.
Recipe slightly adapted from The Nourishing Gourmet.