Snap off tough ends of asparagus; cut each spear in half.
In large bowl, mix asparagus, zucchini, bell pepper, onion and oil.
Sprinkle with 1 teaspoon of the steak seasoning; toss to coat.
Spread vegetables in ungreased 15x10x1-inch pan.
Place on lowest oven rack; bake 5 minutes.
Meanwhile, spray 13x9-inch (3-quart) glass baking dish with cooking spray.
Pat tilapia fillets dry with paper towels.
Brush fish with butter; sprinkle with paprika and remaining 1 teaspoon steak seasoning.
Place in baking dish.
Place baking dish on middle oven rack; bake fish and vegetables uncovered 17 to 18 minutes or until fish flakes easily with fork and vegetables are tender.