Preheat oven to 400 degrees F and line baking sheet with parchment paper. Set aside.
In a large bowl, add ground chicken, egg, breadcrumbs, Parmesan cheese, garlic, olive oil, salt and pepper. Mix with a spatula until combined and do not overmix.
Using small trigger scoop, form about 26 meatballs (it helps to dip hands into a bowl with cold water occasionally) and lay on previously prepared baking sheet.
Bake for 15-20 minutes, turn and toss with spatula (mostly to get rid off of that ground chicken residue) and bake for 5 more minutes.
Serve hot with your favorite side and salad, as an appetizer or make Marry Me Chicken Meatballs.
Notes
Store: Refrigerate in an airtight container for up to 5 days. Reheat in a microwave. I would not bake them in the oven to avoid drying out.
Freeze cooked meatballs: Bake, cool and freeze meatballs in an airtight container for up to 3 months. Then bake from frozen at 400 F for 15-18 minutes.
Freeze raw meatballs: Freeze on a baking sheet until frozen, transfer to a freezer safe storage bag for up to 3 months. Then bake from frozen at 400 F for 25 minutes.
Only bake until done: To prevent over baking (and dry meatballs!) bake only until an instant-read thermometer inserted in center reads 165 degrees. Your meatballs should be white in the center when cut in half.