Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato into 1/2-inch cubes and place them on one side of the baking sheet.
Season the chicken breast with the sea salt, black pepper, and dried oregano, then place it on the other side of the baking sheet.
Drizzle half of the olive oil over the sweet potatoes and toss to coat evenly.
Roast for 20 to 25 minutes until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into bite-sized strips.
In a large serving bowl, combine the baby spinach, chickpeas, roasted sweet potatoes, and sliced chicken.
Whisk the remaining olive oil with the lemon juice and drizzle over the salad, tossing gently to combine.
Top with the crumbled feta cheese and serve immediately while the roasted elements are still warm.