Season chicken breasts on both sides with sea salt and black pepper.
Heat olive oil in a large skillet over medium-high heat.
Add chicken to the skillet and cook for 5 to 7 minutes per side or until the internal temperature reaches 165 degrees Fahrenheit.
Remove chicken from the skillet and set aside on a plate.
In the same skillet, add minced garlic and sun-dried tomatoes, sautéing for 2 minutes until fragrant.
Reduce heat to medium and stir in heavy cream and dried oregano. Bring to a gentle simmer for 3 to 5 minutes until the sauce begins to thicken.
Whisk in the parmesan cheese until melted and smooth.
Add the fresh baby spinach to the sauce and stir until wilted.
Return the chicken to the skillet, coating each piece with the sauce, and serve immediately.