Preheat oven to 425°F. Grease a 13 x 18-inch baking sheet.
Pat the steak dry with paper towels to remove any moisture. Generously season it with salt and pepper. Set aside at room temperature.
Place the potatoes in a large bowl, or directly onto the baking sheet. Drizzle with 2 tablespoons olive oil, 1 teaspoon salt, 1/2 teaspoon pepper, 1 teaspoon garlic powder, and 1 teaspoon Italian seasoning. Mix together until potatoes are coated in olive oil and seasonings.
Place potatoes flat side down in an even layer across the baking sheet. Place in the oven for 20 minutes, or until they are softened.
Remove baking sheet from the oven. Give the potatoes a little stir and scoot them over to the top 1/3 of the baking sheet. Next, place the seasoned steak below the potatoes in the center of the pan. Top with 3 tablespoons of butter slices. Add the tomatoes to the bottom 1/3 of the pan, and the broccoli to the other side. Drizzle the tomatoes and broccoli with 1-2 tablespoons of olive oil and season with 1 teaspoon garlic powder, and salt and pepper to taste. Give them a gentle stir.
Turn the oven to broil and place the baking sheet under the broiler 2-3 inches from the broiler. Cook for 4 minutes, then flip the steak and gently stir the veggies. Broil another 4-6 minutes longer, or until steak is cooked to your desired level of doneness. If vegetables are browning too quickly, place a sheet of aluminum foil over them to slow the browning process.
Remove from oven. Let steak rest for 5 minutes before slicing against the grain. Garnish with chopped parsley and top steaks with a slice of butter.
Notes
For proper cutting, slice steak across the grain. Cover the vegetables with a piece of aluminum foil if they are browning too quickly. (I covered them about halfway through the cooking process.) To avoid soggy vegetables, spread them in as even a layer as possible. It’s hard with this meal because there are so many delicious items on the pan, but it will still taste amazing.
You can rotate the pan halfway if needed for even cooking. Keep food 2-3 inches away from the broiler.