In a large bowl, combine the ground turkey, grated apple, breadcrumbs, Parmesan cheese, egg, chopped fresh sage, minced garlic, salt, and pepper. Mix gently until just combined, about 2-3 minutes.

Pinch off portions of the mixture and roll them into 1-inch meatballs. Place formed meatballs on a parchment-lined tray.

Heat a tablespoon of olive oil in a skillet over medium heat. Once shimmering, add the meatballs and cook for 8-10 minutes, turning occasionally, until golden brown and cooked through.

For a healthier option, preheat oven to 400°F (200°C). Bake meatballs on a parchment-lined sheet for 15-20 minutes.

Once cooked, transfer the meatballs to a serving platter. Serve over pasta, in sliders, or with vegetables.