First, coat the chicken breasts with the flour, making sure to shake off any excess flour.
Turn on your Instant Pot and set it to saute; add your oil when the hot light is displayed. Then brown all of the chicken (you might have to do one batch and then another) on all sides. It’s really important to the dish to get a nice brown.
Transfer all of the cooked chicken to a plate, and then add your garlic, chicken broth, lemon juice, sherry, basil, oregano, salt, and pepper
Return the chicken to the Instant Pot, and add the lid. Cook on manual high pressure for 10 minutes.
Let it naturally release, plate the chicken, add the lemons (if you would like them), and spoon the sauce. Garnish with the capers.
Optional: To thicken the sauce, I removed the chicken, and then I mixed 1 tablespoon of cornstarch and water in a cup, mixed it well, and then added it to the Instant Pot.