Wash and prep produce: Rinse the spinach and pat it dry. Hull and slice the strawberries.
Thinly slice the cucumber. If using avocado, dice it and toss with a little lemon juice to keep it bright.
Make the dressing: In a small jar, combine olive oil, balsamic vinegar, honey, Dijon, and a pinch of salt and pepper. Shake well until it looks smooth and slightly thick.
Taste and adjust sweetness or tang as needed.
Toast the seeds or nuts (optional): Warm a dry skillet over medium heat and toast sunflower seeds or almonds for 2–3 minutes, stirring often, until lightly golden. Let cool.
Assemble the base: Add spinach to a large bowl. Drizzle with about half the dressing and toss lightly so every leaf gets a thin coat.
This keeps kids from getting big bites of plain greens.
Add toppings: Scatter strawberries, cucumber, avocado (if using), chicken (if using), and cheese over the dressed greens. Sprinkle seeds or almonds on top for crunch.
Finish with flavor: Spoon a little more dressing over the top. Keep extra on the side if serving family-style so everyone can add more if they want.
Serve right away: Salad tastes best fresh.
If packing for lunch, see the storage tips below to keep it crisp until mealtime.