Preheat your oven to 200°C (390°F). Line a baking tray with parchment paper. Pat your salmon fillets dry with a paper towel — dry fish browns beautifully, wet fish steams instead. We want that gorgeous golden crust.
Place your salmon fillets skin-side down on one half of the baking tray. Drizzle with olive oil and rub it gently over the surface. Sprinkle garlic powder, black pepper, and dried oregano evenly over both fillets. Lay two or three lemon slices directly on top of each fillet. No salt needed — you won't miss it.
Trim the woody ends off your asparagus by snapping them where they naturally break, or cut about 3cm off the bottom. Arrange on the other half of the baking tray. Drizzle with olive oil, add black pepper and garlic powder, and toss lightly to coat.
Slide the tray into the middle of the preheated oven and bake for 13–15 minutes depending on fillet thickness. The salmon is done when it flakes easily with a fork and the centre is just barely opaque. The asparagus should be tender with light colour on the tips. Don't overbake.
While the salmon bakes, combine the yogurt, fresh dill, lemon juice, minced garlic, and black pepper in a small bowl. Stir well. It should taste bright, herby, and fresh.
Lay your asparagus spears on the plate as a base, then place the salmon fillet directly on top. Spoon the lemon dill sauce generously alongside or over the fish. Finish with a few fresh dill fronds and a thin lemon slice. Eat immediately — salmon waits for no one.