1. Heat oven to 375 degrees F. Line two baking sheets with foil; spray with oil and set aside. Place bread slices directly on oven rack and bake 5 to 6 minutes per side, until crisp.
2. Break bread into pieces and place in bowl of food processor; process until crumbs are formed. Add salt, paprika, garlic powder, and pepper. Pulse to combine. Transfer to large resealable plastic bag.
3. In large bowl, beat egg; add chicken pieces and stir well. Transfer chicken pieces, 10 at a time, to bag; toss to coat evenly. Arrange on prepared baking sheets. Lightly spray with oil.