Preheat oven to 425 degrees.
Soak 2 slices of bread (whole wheat, white, or gluten-free) in 1/4 cup milk.
While bread is soaking, heat skillet over medium heat, and melt butter.
Saute onions and herbs until softened in melted butter. Remove from heat.
In large mixing bowl, mix together onions, bread, milk, seasonings and egg until well combined.
Add ground turkey to mixture and mix meatball mixture with your hands, as to not overwork your meatballs.
Scoop the meatball mixture with a medium cookie scoop unto rimmed sheet pan.
Pour 1 cup chicken or turkey stock around meatballs. This trick allows meatballs to stay moist and tender and lower in fat.
Bake meatballs for 25 minutes.