Heat the olive oil in a large skillet over medium-high heat.
Season the chicken thighs with salt, pepper, and Italian seasoning before adding them to the skillet.
Add the chicken thighs to the skillet and cook for about 4-5 minutes per side, until golden brown and cooked through.
Remove the chicken from the skillet and set aside on a plate.
In the same skillet, add the chopped onion and sauté until translucent, about 3-4 minutes.
Stir in the garlic and sun-dried tomatoes, cooking for an additional minute until fragrant.
Pour in the heavy cream and Italian seasoning, stirring to combine and simmer for 2-3 minutes until slightly thickened.
Return the chicken to the skillet, coating it in the sauce and letting it cook for an additional 5 minutes to absorb the flavors.
Serve warm, garnished with fresh basil leaves.