Step 1. Preheat broiler. Place a baking sheet in oven while broiler preheats.
Step 2. Combine flour, salt, and pepper in a shallow dish. Place breadcrumbs in a shallow dish. Place egg whites in a small bowl, and whisk until foamy.
Step 3. Halve avocados, remove pits, and cut each half into 6 wedges. Pull off peels.
Step 4. Dredge avocado wedges in flour, dip in egg white, and then dredge in breadcrumbs. Remove baking sheet from oven; coat with avocado oil. Place avocado slices on baking sheet; coat avocados with cooking spray.
Step 5. Broil 5 minutes or until brown on top. Turn and broil 2 more minutes. Remove and serve with lemon wedges.