01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or foil.
02 - Pat the salmon fillets dry with paper towels. Place them skin-side down on the prepared baking sheet. Brush with olive oil and season with salt and pepper.
03 - Bake for 12–15 minutes, or until salmon flakes easily with a fork and is just opaque in the center.
04 - While the salmon bakes, prepare the sauce: In a medium saucepan over medium heat, melt the butter. Add garlic and sauté for 30 seconds until fragrant.
05 - Stir in the flour to make a roux; cook for 1 minute, stirring constantly. Gradually whisk in the broth, then the heavy cream.
06 - Add lemon zest, lemon juice, dill, salt, and pepper. Simmer gently for 3–4 minutes until slightly thickened. Taste and adjust seasoning as needed.
07 - Remove salmon from the oven. Plate the fillets and spoon the dill and lemon sauce generously over each. Garnish with lemon slices and extra dill. Serve immediately.