In a large skillet, heat about two tablespoons of extra virgin olive oil over medium-high heat.
Salt & pepper the chicken, both sides.
Use tongs to transfer the chicken to the skillet and let it brown, about 3 minutes
Flip the chicken, then add the mushrooms and onion to the skillet. While the chicken continues to brown on the other side, occasionally stir the mushrooms and onion.
Add the artichokes, capers, and tomato sauce to the skillet. Stir until everything's incorporated in the sauce and the chicken is coated.
Turn the heat down to low and let the chicken simmer in the sauce for 10 minutes.
Serve this Tuscan Chicken over your favorite pasta.