Preheat the oven 425.
Unwrap the chicken and place with the spine facing upwards. To spatchcock it, take sharp kitchen shears and cut along either side of the tail along the spine. You will be cutting through the thin rib bones making this process a bit easier that it may initially seem. Once the spine is completely removed, open up the chicken, season the inside with salt & pepper. Next, place the open ribs pressed down onto a baking sheet. This is optional, but you can use a bit of force to break the collar bone and press the chicken flatter.
Take your finger and gently slide under the skin along the breasts, thighs and legs.
In a small bowl, fold the ricotta, herbs, lemon zest, and egg together. Roll up your sleeves to get a bit messy and scoop a dollop of the herb ricotta pushing it under the skin all around the flesh of the chicken.
Wash and dry your hands well (I am always a mess after this) and sprinkle the outside of the chicken first with the lemon juice, then the salt and pepper.
Place in the oven for about 35-60 minutes depending on the size of your chicken until the internal temperature is 165. Thermometers are the easiest way to know it is cooked through, but not overcooked.