In a medium mixing bowl, combine the ground chicken, egg, chopped parsley, chopped dill, lemon zest, minced garlic, sea salt, and black pepper.
Gently mix the ingredients by hand until just combined, taking care not to overwork the meat to ensure a tender texture.
Scoop and roll the mixture into 1.5-inch meatballs, yielding approximately 6 to 8 balls.
Heat the extra virgin olive oil in a large non-stick skillet over medium heat.
Add the meatballs to the skillet and sear for 4 to 5 minutes per side, or until golden brown and the internal temperature reaches 165 degrees Fahrenheit.
Remove the meatballs from the skillet and set them aside on a plate.
In the same skillet, add the baby spinach and lemon juice, sautéing for about 60 seconds until the leaves are just wilted.
Plate the lemon-herb meatballs over the bed of wilted spinach and serve immediately.