Preheat your oven to 375°F (190°C).
In a small skillet, sauté the minced garlic and fresh spinach until the spinach is fully wilted.
In a small bowl, combine the wilted spinach mixture with the Neufchatel cheese and grated parmesan.
Using a sharp knife, cut a pocket into the thickest part of the chicken breast, being careful not to cut all the way through.
Stuff the spinach and cheese mixture into the pocket and secure the opening with two toothpicks.
Season the outside of the chicken breast with sea salt and black pepper.
Heat olive oil in an oven-safe skillet over medium-high heat and sear the chicken for 3 minutes per side until golden brown.
Arrange the asparagus spears around the chicken in the skillet or on a separate baking sheet.
Transfer to the oven and roast for 12-15 minutes, or until the chicken reaches an internal temperature of 165°F.
Remove toothpicks before serving alongside the roasted asparagus.