Preheat your oven to 400 degrees Fahrenheit and line a baking sheet with parchment paper.
In a large bowl, combine ground chicken, breadcrumbs, Parmesan cheese, garlic, and egg. Mix until just combined.
Form the mixture into 1-inch meatballs and place them on the prepared baking sheet.
Bake in the preheated oven for 20-25 minutes, or until the meatballs are golden brown and cooked through. Turn the meatballs halfway through the baking time.
Remove from the oven and let rest for a few minutes before serving.
Notes
For the juiciest meatballs, avoid over-mixing the ingredients as this can make them tough.
You can use a cookie scoop to make uniform meatballs.
For even baking, turn the meatballs halfway through the cooking time.
If you want your meatballs to have a nice brown crust, broil them for the last 2-3 minutes of baking.
Let the meatballs rest for a few minutes before serving to help them keep their shape.