Preheat Oven & Prep Sheet Pan: Position oven rack in the center and preheat oven to 400°F (200°C). Line a large rimmed baking sheet with parchment paper or heavy-duty foil for effortless cleanup.
Whisk the Honey Dijon Glaze: In a small bowl, whisk together the honey, whole-grain Dijon mustard, 1 tablespoon olive oil, minced garlic, lemon juice, chopped fresh dill, smoked paprika, 1/4 tsp salt, and black pepper until smooth and emulsified.
Season the Asparagus: Place trimmed asparagus spears on one side of the prepared baking sheet. Drizzle with 1 tablespoon olive oil, squeeze fresh lemon juice, and season with remaining 1/4 tsp salt and pepper. Toss to coat and spread into a single layer.
Arrange & Glaze Salmon: Pat salmon fillets dry with paper towels. Place them skin-side down on the other side of the baking sheet. Generously brush each fillet with 2/3 of the honey Dijon glaze, coating top and sides evenly.
Bake to Flaky Perfection: Bake at 400°F (200°C) for 12 to 14 minutes, depending on fillet thickness. For bubbly caramelized edges, switch the oven to BROIL on HIGH for the final 2 minutes, watching carefully to avoid burning the honey glaze.
Garnish & Serve: Remove sheet pan from oven. Spoon remaining reserved glaze over warm salmon fillets. Garnish with fresh dill sprigs, lemon slices, and microgreens. Serve immediately with roasted asparagus and your favorite grain or potatoes.