Place pecans in a single layer in a shallow pan.
Bake at 350° for 10 minutes or until lightly toasted, stirring occasionally.
Process toasted pecans, baking mix, salt, and pepper in a food processor until pecans are finely ground. Place 1/2 cup pecan mixture in a large bowl. Add chicken, tossing to coat.
Whisk together eggs and buttermilk. Dip chicken in milk mixture; dredge in remaining pecan mixture. Arrange chicken in a single layer on a lightly greased aluminum foil-lined baking sheet. Lightly coat tops of chicken with vegetable cooking spray.
Bake at 425° for 20 to 25 minutes or until chicken is golden brown. Arrange on a serving platter, and garnish, if desired.