Preheat oven to 400°F. Prep a sheet pan with foil and a light layer of nonstick cooking spray.
Prep the vegetables: Rinse, dry. and cut mushrooms in half. Wash potatoes if leaving skin on then cut into 1-inch cubes. Wash and dry asparagus, then trim and discard woody ends.
In a medium bowl, toss potatoes with 1 T olive oil, salt, and ½ t garlic powder; spread on sheet pan keeping space between. Bake potatoes for about 10 minutes.
While the potatoes roast: Pat the steak pieces dry. Season steak pieces on both sides with steak seasoning; set aside.
Remove pan from oven. Place the seasoned steak pieces on the pan. Arrange asparagus in clusters around the hot potatoes; drizzle with remaining olive oil and sprinkle with remaining ½ t garlic powder. Sprinkle Parmesan over potatoes and asparagus. Add mushrooms to open spaces on the pan.
Add pan back to hot oven to finish roasting everything together for 12 minutes. Check steak so that it reaches your desired doneness.
Let steak rest 1 minute then slice and plate immediately with servings of vegetables and a spoonful of pan juice. Season further with S&P to taste. Crusty garlic bread complements this dinner beautifully.