Preheat oven to 400°.
Heat 1 teaspoon sesame oil in a large nonstick skillet over medium-high heat. Add garlic; sauté 30 seconds. Add bok choy and 1/4 teaspoon of salt; sauté 5 minutes or until crisp-tender. Remove from heat; stir in chile paste. Sprinkle fish evenly with 1/4 teaspoon salt and pepper.
Cut 4 (15-inch) squares of parchment paper. Fold each square in half, and open each. Place 1/2 cup bok choy near fold; top with 1 fillet. Drizzle each serving with 1/2 teaspoon oil; sprinkle with 1/4 teaspoon sesame seeds. Fold papers; seal edges with narrow folds. Place the packets on a baking sheet. Bake at 400° for 18 minutes or until paper is puffy and lightly browned. Place 1 packet on each of 4 plates, and cut open. Serve immediately.