To spatchcock/butterfly the chicken, remove the giblets and pat dry the chicken. Use a pair of kitchen shears to cut down each side of the backbone from the cavity up to the neck.
Make a shallow incision cut in the cartilage on the back of the breast bone and use your hands to gently press both sides down to flatten the bird. Cut out the chicken wing end at the joint to prevent burning.
To season, pat dry before coating with olive oil. In a small bowl, mix melted butter with garlic paste and pour over the chicken. Add salt, pepper, thyme, and rosemary.
Massage the seasoning mixture into the chicken and underneath the skin. Drizzle freshly squeezed lemon juice over the chicken and place lemon slices underneath before baking.
Bake for 45 minutes at 375F plus 7 minutes at 425F. Let it rest for 5 minutes before cutting and Enjoy!