Rinse the spinach leaves thoroughly under cold water and pat them dry with a paper towel. Place the spinach in a large salad bowl.
Cut the avocados in half lengthwise and remove the pit. Use a spoon to scoop out the flesh, and then slice it into thin pieces. Add the avocado slices to the salad bowl.
In a small bowl, whisk together the olive oil, squeezed lime, and lemon juice. Season with salt and pepper to taste.
Drizzle the dressing over the ingredients in the large bowl. Use salad tongs to gently toss the salad, ensuring all ingredients are evenly coated with the dressing.
Sprinkle the toasted sunflower seeds over the top of the salad.
Transfer the salad to individual serving plates or bowls and serve immediately. Enjoy!