In a medium bowl, combine the ricotta cheese, egg, sea salt, and black pepper until smooth.
Gently fold in the all-purpose flour until a soft, slightly tacky dough forms.
Bring a small pot of salted water to a gentle boil.
Using two small spoons, drop tablespoon-sized portions of the ricotta mixture into the boiling water.
Cook for 2-3 minutes or until the gnocchi float to the surface, then remove with a slotted spoon.
While gnocchi cook, heat olive oil in a non-stick skillet over medium-high heat and sauté diced chicken breast until golden and cooked through.
Add the cooked gnocchi to the skillet with the chicken, pan-searing for 1 minute to develop a light crust.
Stir in the fresh baby spinach, lemon zest, and lemon juice, tossing until the spinach is just wilted.
Serve immediately topped with a sprinkle of grated parmesan cheese.