Wash the strawberries thoroughly under cool water. Remove the stems and slice them into thin, even pieces. Set them aside while preparing the remaining ingredients.
Place a small skillet over medium heat and add the butter. Once melted, stir in the brown sugar and pecans. Continue stirring for 2 to 3 minutes until the sugar melts and coats the pecans evenly.
Transfer the coated pecans to a plate lined with parchment paper. Allow them to cool completely so they become crisp and crunchy.
Add the fresh spinach leaves to a large salad bowl. Arrange the sliced strawberries evenly over the spinach for a colorful presentation.
Sprinkle the crumbled goat cheese or feta cheese across the salad. Scatter the cooled candied pecans on top for texture and sweetness.
Drizzle the balsamic vinaigrette over the salad just before serving. Toss gently to coat all ingredients without crushing the strawberries.
Transfer the salad to serving plates or a large serving platter. Enjoy while the spinach is crisp and the pecans remain crunchy.