Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the cubed sweet potato with one teaspoon of olive oil and a pinch of sea salt, then roast for 20-25 minutes until tender and slightly browned.
Season the chicken breast with dried oregano, salt, and pepper.
Grill the chicken over medium-high heat for approximately 6-7 minutes per side until the internal temperature reaches 165°F.
Remove the chicken from the heat and let it rest for 5 minutes before slicing it into thin strips.
In a large salad bowl, whisk together the remaining teaspoon of olive oil and the lemon juice to create a light dressing.
Add the baby spinach to the bowl and toss thoroughly to coat the leaves evenly.
Top the spinach with the roasted sweet potato cubes, the sliced grilled chicken, and a final sprinkle of toasted pepitas.