Wash Spinach: Rinse the baby spinach well and spin dry in a salad spinner or pat with paper towels.
Prepare Berries: Slice strawberries thinly. Wash blueberries and other berries if using a mix.
Toast Almonds: Heat a small pan over medium heat. Toast almonds for 3–4 minutes until lightly golden and fragrant. Set aside to cool.
Assemble Salad: In a large bowl, add spinach, then layer berries and almonds evenly.
Add Extras: Sprinkle feta cheese and mandarin oranges if using.
Dress Salad: Drizzle 2 tablespoons of poppyseed dressing over the salad. Toss gently so everything is coated.
Serve: Transfer to your favorite serving bowl. Enjoy immediately for the freshest taste.