Preheat the oven to 375°F (190°C).
In a large bowl, add the 1 lb. red potatoes (quartered), 2 cups green beans (snipped), 1 tablespoon olive oil, salt and pepper to taste, and 2 teaspoons garlic powder. Toss until the potatoes and green beans are evenly coated.
Spread the seasoned potatoes and green beans in a single layer on a large baking sheet.
Bake the vegetables for 10 minutes.
While the vegetables bake, make the toppings: in a small bowl combine 1/2 cup honey mustard and 2 tablespoons dry mustard. In a second small bowl combine 1 cup panko bread crumbs, 1/4 cup grated parmesan cheese, and 1/2 cup fresh parsley (chopped).
Pat the 46 ounce salmon filets (skin removed) dry with paper towels. Spread the mustard mixture in a thick layer on one side of each salmon filet.
Press the panko–parmesan–parsley mixture onto the mustard-coated side of each salmon filet so the crumb mixture adheres.
After the vegetables have baked 10 minutes, remove the baking sheet from the oven. Make room on the sheet and place the salmon filets, mustard/panko side facing up, on top of or next to the partially cooked vegetables. Scatter the 2 cups whole cherry tomatoes around the salmon and vegetables.
Return the baking sheet to the oven and bake 15–18 minutes more, or until the salmon is opaque throughout and flakes easily with a fork.
Remove from the oven and serve the salmon alongside the roasted potatoes, green beans, and tomatoes.