Preheat the oven to 375 degrees f.
Cut the chicken breast in half, length-wise, but just enough to make a pocket, as shown.
Rub the inside of the chicken breast with lemon zest, sea salt and pepper.
Place chicken on a cutting board and stuff each equally with the mozzarella, asparagus and sun dried tomato, then fold over.
Insert a large toothpick to close the pocket.
Rub the chicken with a pinch of garlic salt and pepper.
Heat oil in a large and oven safe skillet over medium-high heat.
Sear the chicken for 3 minutes per side then place the skillet in the oven.
Bake in your preheated 375 degree oven for about 15-20 minutes, or until cooked through and no longer pink in the inside.