Heat olive oil in a large skillet over medium heat. Season chicken with salt, pepper, and oregano. Cook for about 8 minutes per side until golden and fully cooked (165°F internal temperature). Remove and set aside.
In the same skillet, melt butter. Add garlic and cook for 1 minute until fragrant. Stir in cherry tomatoes, season, and cook until softened and slightly burst.
Add spinach and cook until wilted. Pour in heavy cream and stir in Parmesan. Bring to a gentle simmer.
Reduce heat and let the sauce thicken slightly. Return chicken to the skillet and cook for 5–7 minutes until heated through.
Serve Creamy Tuscan Chicken with sauce spooned over the top and lemon wedges on the side