Dice the chicken breast into 1-inch cubes and season with half of the sea salt and black pepper.
Core and slice the apple into thin wedges and finely dice the yellow onion and garlic.
Heat the olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and cook until golden brown and cooked through, about 5 to 7 minutes, then remove and set aside.
In the same skillet, add the potato gnocchi and cook for 3 to 4 minutes until they develop a light golden crust.
Stir in the onions and apples, sautéing until the onions are translucent and apples are slightly softened.
Add the minced garlic, dried sage, and the remaining salt and pepper, cooking for 1 minute until fragrant.
Pour in the chicken broth to deglaze the pan, scraping up any browned bits from the bottom with a wooden spoon.
Return the cooked chicken to the skillet and toss everything together until the sauce has slightly thickened and all ingredients are well combined.