Preheat your oven to 425°F (220°C). This temperature will ensure your salmon and vegetables roast perfectly, achieving that coveted crispy texture.
In a large bowl, toss the quartered red potatoes and snipped green beans with olive oil, salt, pepper, and garlic powder. Make sure everything is well-coated for maximum flavor.
Spread the seasoned potatoes and green beans evenly on one side of the baking sheet. This will allow them to roast beautifully while the salmon cooks.
In a separate bowl, whisk together the honey mustard, dry mustard, and chopped parsley. This glaze will add a rich and tangy flavor to the salmon.
Pat the salmon filets dry with a paper towel. Brush each filet generously with the honey mustard glaze, ensuring each piece is well-coated.
Place the glazed salmon filets on the baking sheet, nestled between the potatoes and green beans. This allows the flavors to meld together as everything roasts.
In a small bowl, mix the panko bread crumbs and grated parmesan cheese. Sprinkle this mixture over the salmon for a deliciously crispy topping.
Transfer the baking sheet to the preheated oven and roast for about 15-20 minutes, or until the salmon flakes easily with a fork and the vegetables are tender and slightly caramelized.
In the last 5 minutes of cooking, add the whole cherry tomatoes to the baking sheet. This will give them just enough time to burst and add a juicy, fresh component to the dish.
Once everything is cooked to perfection, remove the sheet pan from the oven. Serve the Honey Mustard Salmon and Potatoes hot, garnished with additional chopped parsley if desired.