Place a dry skillet over medium heat and add the pine nuts, tossing frequently for 2-3 minutes until they are golden brown and fragrant.
Remove the pine nuts from the pan and set them aside to prevent over-toasting.
Season the chicken breast evenly on both sides with the sea salt and black pepper.
In the same skillet, heat the extra virgin olive oil over medium-high heat.
Add the chicken breast to the pan and cook for 6-7 minutes per side, or until the internal temperature reaches 165°F and the outside is golden.
Remove the chicken from the pan and let it rest for 5 minutes before slicing.
While the chicken rests, add the minced garlic to the skillet and sauté for 30 seconds until aromatic.
Add the fresh spinach to the pan and toss with the garlic until just wilted, which should take about 1-2 minutes.
Squeeze the lemon juice over the spinach and stir to combine the flavors.
Slice the chicken and serve it over the bed of garlic spinach, garnished with the reserved toasted pine nuts.