01 - Preheat oven to 400°F. Line a baking tray with parchment paper.
02 - Toss halved strawberries with 1 tablespoon olive oil, 1 tablespoon honey or maple syrup, and a pinch of salt. Spread on the baking tray and roast for 15–18 minutes, until juicy and slightly caramelized. Let cool.
03 - Bring 2 cups water or broth to a boil in a saucepan. Add rinsed quinoa, reduce heat to low, cover, and simmer for 15 minutes. Remove from heat and let stand, covered, for 5 minutes. Fluff with a fork and allow to cool slightly.
04 - Whisk together olive oil, balsamic vinegar, Dijon mustard, honey or maple syrup, salt, and pepper until emulsified.
05 - In a large bowl, combine spinach, cooked quinoa, roasted strawberries with their juices, almonds or pumpkin seeds, red onion, and feta if using. Drizzle with dressing and gently toss to combine.
06 - Taste and adjust seasoning as needed. Serve immediately or chilled.