Pound the chicken breasts to 1/2-inch thickness and season both sides with salt and ground black pepper.
Heat 2 tablespoons olive oil in a large skillet over medium heat.
Add the chicken to the hot skillet and cook 4–5 minutes per side, until the internal temperature reaches 165°F and no longer pink; transfer chicken to a plate.
Reduce heat to medium, add 1 teaspoon minced garlic to the skillet and cook, stirring, for about 30 seconds until fragrant.
Stir in 1 1/4 cups half & half, the drained 14-ounce can of marinated artichoke hearts, 1/4 cup chopped sun-dried tomatoes, and 1/3 cup pitted kalamata olives; simmer 5–6 minutes until slightly thickened.
Stir in 1/4 cup parmesan cheese until melted, return the chicken to the pan, reduce heat to medium-low, and cook about 5 minutes to warm through and meld flavors.
Remove from heat, sprinkle with 1/4 cup feta cheese and 2 tablespoons sliced fresh basil, then serve.