Cook the Quinoa: Rinse quinoa under cold water. In a medium saucepan, bring 2 cups of water to a boil. Add quinoa, reduce heat to low, cover, and simmer for 15 minutes or until the water is absorbed. Fluff with a fork and let cool.
Season and Cook Salmon: Rub salmon fillets with olive oil, salt, and pepper. Heat a grill pan or skillet over medium-high heat. Cook the salmon for 4–5 minutes per side, or until it flakes easily with a fork. Let it rest, then flake into large chunks.
Make the Dressing: In a small bowl, whisk together olive oil, lemon juice, mustard, honey, garlic, salt, and pepper until well combined.
Assemble the Salad: In a large bowl, combine cooked quinoa, cherry tomatoes, cucumber, red onion, avocado, and salad greens. Drizzle with dressing and toss gently.
Add Salmon and Herbs: Top with flaked salmon and fresh parsley or dill. Toss lightly again or leave the salmon on top for presentation.
Serve: Plate it up and enjoy immediately, or refrigerate for later.