Thaw bread dough in refrigerator at least 12 hours.
. Preheat oven to 400°.
. Heat 1 tablespoon oil in a large nonstick skillet over medium heat. Add onion and sugar; cook 20 minutes or until golden brown, stirring occasionally. Remove from heat; stir in rosemary, thyme, salt, and pepper.
. Place dough on a lightly floured surface; let rest 5 minutes. Pat or roll dough into a 14 x 8-inch rectangle (about 1/4 inch thick). Place on a baking sheet coated with cooking spray. Brush dough with remaining 1 tablespoon oil. Spread onion mixture and walnuts evenly over dough, leaving a 1/2-inch border on all sides; sprinkle evenly with cheese. Bake at 400° on bottom rack of oven for 25 minutes or until crust is golden. Cut into 12 pieces.