If using oven, preheat to 400 degrees. If using air fryer, preheat to 390.
Dip the cut zucchini in beaten egg then dredge in breadcrumbs.
Place zucchini evenly spaced out in baking sheet or in air fryer basket (work in batches if needed) then coat with avocado oil spray. Bake in oven for 20 minutes or air fry for 8 minutes.
Serve immediately and enjoy!