Toss potatoes with half the dressing; spread onto foil-covered rimmed baking sheet sprayed with cooking spray.
Bake 20 to 25 min. or until potatoes are crisp-tender.
Remove from oven. Spoon potatoes onto half the baking sheet.
Combine bread crumbs, nuts and half the onions in shallow dish.
Pour remaining dressing into separate shallow dish.
Dip fish, 1 fillet at a time, into dressing, then into crumb mixture, turning to evenly coat both sides of each fillet with each ingredient.
Place on baking sheet next to potatoes.
Bake 12 to 15 min. or until potatoes are tender and fish flakes easily with fork. About 5 min. before potatoes and fish are done, heat teriyaki sauce in medium skillet on medium heat.
Add peppers and snow peas; stir-fry just until crisp-tender.