Pound each chicken breast to 1" thickness with meat mallet.
Mix together 1 teaspoon salt and ½ teaspoon ground black pepper in a small bowl. Sprinkle over chicken breast on each side.
Heat a skillet over medium high heat. Once hot, add 2 tablespoon olive oil and 1 tablespoon salted butter.
Once butter melts, sear the chicken for 3-4 minutes, until golden brown crispy coating forms. Repeat on the other side. Once cooked, transfer the chicken to a plate.
Turn the heat to low medium. Now add the sauce ingredients to the pan: The 10.5 oz cream of chicken soup, 1 cup milk, ½ cup sour cream, ½ teaspoon garlic powder, ½ teaspoon onion powder, and 1 oz packet of ranch seasoning mix. Mix together and heat through for 3 minutes, stirring occasionally and gently scraping the bottom of the pan.
Now add the chicken back to the pan and spoon the sauce over top. Cook another 2-3 minutes, or until the chicken is heated through.
Remove from heat and transfer the chicken to serving plates, drizzling the sauce on top. Let sit 5 minutes before cutting into the chicken. Now it's ready to serve.