01 -
Set the oven to 400°F (200°C) to prepare for baking.
02 -
In a small bowl, whisk together balsamic vinegar, olive oil, minced garlic, dried oregano, salt, and pepper until thoroughly combined.
03 -
Place chicken breasts in a baking dish and pour the marinade over them, ensuring each piece is evenly coated.
04 -
Bake the chicken for 20 minutes in the preheated oven.
05 -
While chicken bakes, heat a large skillet over medium heat. Add fresh spinach and halved cherry tomatoes, cook until spinach wilts and tomatoes soften, about 3 to 4 minutes.
06 -
Remove chicken from oven, evenly distribute the sautéed spinach and tomatoes over the breasts.
07 -
Return the chicken to the oven and bake an additional 10 to 15 minutes, or until internal temperature reaches 165°F (75°C).
08 -
Optionally, sprinkle grated Parmesan cheese over the top before serving.