In a large skillet, heat olive oil over medium-high heat. Season the chicken thighs with salt and pepper.
Add the chicken thighs to the skillet and sear for about 5-7 minutes on each side until golden brown and cooked through. Remove the chicken from the skillet and set aside.
In the same skillet, reduce the heat to medium and add the minced garlic. Sauté for 1-2 minutes until fragrant.
Pour in the heavy cream and add the Italian seasoning. Bring to a gentle simmer, stirring occasionally.
Gradually whisk in the grated Parmesan cheese until the sauce is smooth and creamy.
Add the spinach leaves and cherry tomatoes to the skillet, stirring until the spinach is wilted and the tomatoes are slightly softened.
Return the chicken thighs to the skillet, nestling them into the creamy sauce. Let everything simmer together for about 3-4 minutes to warm through.
Taste and adjust seasoning with more salt and pepper if needed.