Preheat the oven to 400°F (200°C). Line a jelly roll pan with foil leaving 2 inches of overhang on the long sides and lightly spray the foil with nonstick spray.
Place the salmon in the center of the foil (skin side down if present) and fold the foil sides up snugly around the fish, leaving it in the pan; push the salmon to one side to make room for the broccoli.
In a medium bowl, microwave 2 tablespoons butter with the minced garlic just until the butter is melted and the garlic is fragrant; whisk in lemon juice, honey, soy sauce, Dijon mustard, chopped parsley, 1 teaspoon salt, 1 teaspoon onion powder, 1/2 teaspoon dried dill, 1/2 teaspoon paprika, and 1/4 teaspoon pepper until smooth.
Pour the lemon-garlic butter sauce evenly over the salmon.
In a small bowl, combine 2/3 cup panko, 2 tablespoons melted butter, and 1/2 cup freshly grated Parmesan until the butter is evenly absorbed; press the mixture evenly over the top of the salmon.
Toss the broccoli florets with 2 1/2 tablespoons olive oil, 1/4 teaspoon salt, and 1/8 teaspoon pepper; spread them in a single layer on the open side of the pan next to the salmon.
Bake uncovered at 400°F for 12–15 minutes, or until the salmon flakes easily with a fork (time depends on thickness) and the broccoli is tender-crisp.
Broil for about 1 minute, watching closely, until the panko topping is golden brown.
Garnish with additional chopped fresh parsley if desired and season with extra salt and pepper to taste before serving.