||Preheat oven to 450°F. Line a baking sheet with aluminum foil and coat with cooking spray.
||Put walnuts in a heavy duty re-sealable plastic bag. Close bag. Use a rolling pin to crush nuts into fine pieces. Add crumbs, rosemary, garlic powder, salt and pepper.
||Lightly beat egg in a shallow dish. Place half the chicken strips into egg and turn to coat. Lift chicken strips with tongs or fork, letting excess egg drain off; put into bag with crumbs. Close bag. Gently shake bag and press walnuts onto chicken.
||Use tongs to remove chicken from bag and place on prepared pan, leaving space between pieces. Repeat dipping and coating procedure with remaining chicken. Bake 8-10 minutes until golden brown and cooked through (170°F).
||Meanwhile, combine marinara and red pepper in a small saucepan or microwave-safe dish. Heat just until warm. Serve over chicken strips.