Season the Chicken: In a small bowl or directly on a cutting board, coat the chicken tender strips evenly with the garlic powder, paprika, salt, and pepper.
Sauté the Chicken: Heat the olive oil in a non-stick skillet over medium heat. Add the chicken strips and sauté for 4–5 minutes per side until golden brown and the internal temperature reaches 165°F.
Wilt the Spinach: During the last 2 minutes of cooking, add the fresh spinach to the pan. Use tongs to toss it with the chicken until it wilts and absorbs the pan juices.
Add Cheese: Sprinkle your choice of cheese over the hot chicken and spinach. Cover with a lid for 30 seconds to allow the cheese to melt completely. Serve immediately.