Preheat oven to 375°F and line a baking dish with aluminum foil.

In a large bowl, combine ground turkey, finely chopped onion, seasoned bread crumbs, salt, black pepper, cooking sherry, steak sauce, garlic powder, and beaten egg.

Mix thoroughly with your hands until all ingredients are evenly distributed.

Shape the mixture into approximately 16 medium-sized meatballs and place them on the foil-lined baking dish.

Sprinkle meatballs with a dash of adobo seasoning.

Bake for about 40 minutes, or until meatballs are fully cooked through.

While meatballs are baking, warm the French bread loaves in the oven until crusty on the outside but still soft inside.

Reduce oven temperature to 325°F after removing the meatballs.

Slice bread loaves lengthwise and arrange meatballs along the bottom halves.

Spoon spaghetti sauce over the meatballs and top with a generous amount of shredded mozzarella cheese.

Return assembled subs to the oven just until cheese melts and begins to bubble.

Cut each loaf in half to make four sandwiches total and serve immediately.