Mix ground chicken, egg, breadcrumbs, onion, garlic powder, Italian seasoning, salt, and pepper until just combined.
Let mixture rest 5 minutes so breadcrumbs absorb moisture.
Shape into about 6 patties, each around 1/2 inch thick.
Heat olive oil in a skillet over medium heat.
Cook patties 4–5 minutes on the first side.
Flip and cook another 4–5 minutes.
Check the thickest part reaches 165°F.
Reduce heat if the outside browns too quickly and continue cooking.
Rest cooked patties 3–5 minutes before serving.